row spacing in relation to yield and quality of some

J. Agric. Sci. Mansoura Univ., 27(7): 4329-4338

ROW SPACING IN RELATION TO YIELD AND QUALITY OF SOME PROMISING SUGARCANE VARIETIES Ahmed A. Z.; E.A.E Nemeat Alla and A.M.A. Ismail Sugar crops Res., Inst., Agric. Res. Center, Giza, Egypt

ABSTRACT This work was carried out at El-Mattana Agricultural Research Station, Qena Governorate, Egypt, during 1999/2000 and 2000/2001 seasons to study the effect of three inter-row spacing (80,100 and 120 cm) on yield and quality of three promising sugarcane varieties viz. F.160, F.153 and Ph. 8013. Treatments were arranged in a strip plots design with four replications. The results cleared that the examined inter-row spacing significantly affecte d number of plants/m 2 at ages of 60, 90 and 120 days from planting, number of millabl e cane/m 2, cane yield, sugar yield. The widest row spacing (120 cm) gave the highest values of the studied characters compared with the other row spacing. Sugarcane varieties differed significantly in all studied characters. Variety F.160 recorded the highest values of millable cane height, d iameter, brix %, s u cro s e % and sugar yield. The highest sugar yield was obtained by planting F. 160 vari e ty a t 120 cm. row spacing.

INTRODUUTION Improving sugarcane varieties to sustain profitable sugar industry is continuous demand for the growers and sugar production. These new promising genetically possess ability of high yield, quality and tolerant the adverse conditions. In addition, some agronomic practices such as plant population in terms of row spacing play an important role with relation to the ability of varieties to achieve the full potential of its production capacity. Nandihalli and Singh (1982) noted that sugarcane yield increased with increasing row spacing from 78.92 t/ha at 45 cm to 109.05 t/ha at 90 cm. Prasad et al. (1983) found that 90 cm Inter-row spacing gave thicker millable cane and higher yield than that planted at 70 cm. Taha (1983) reported that NCo.310 variety had more tillering capacity than G.T. 54-9 variety while it was superior to NCo.310 in millable cane diameter as well as cane yield. Mali and Singh (1986) mentioned that commercial cane yield production was significantly higher at 90 cm than at 60 cm. Misra and Mathur (1986) found that variety Co.7717 showed a significant superiority over Co.J. 64 variety in tillers, thickness, height and yield of cane plant. Devi et al. (1990) pointed out that cane yield was significantly affected by row spacing while brix % and sucrose % were unaffected. Patil et al. (1990) found that the brix % and sucrose content were not significantly affected by using three inter-row spacing of 60, 75 and 90 cm. Ahmed (1995) reported that G.85-37 variety was superior over G.T. 54-9 and G. 74-96 varieties in stand density, millable cane height, diameter, brix %, sucrose % and sugar yield. Mohamed (1997)

found that millable cane diameter and number of millable cane/m 2 increased with increasing the inter-row spacing from 100 up to 140 cm. Ahmed (1998) reported that sugarcane varieties significantly differed in stand density, yield components, quality, cane and sugar yields. Abd El-Latif et al. (1999) revealed that increasing row spacing from 80 to 120 cm increased stalk height, stalk diameter and cane yield. They added that there were insignificant differences among inter-row pacing in brix % and sucrose %. Yousef et al. (2000) stated that there were significant differences among the tested varieties in number of millable cane/m 2, millable cane length, diameter and cane yield. Mohamed and Ismail (2002) found that sugarcane varieties (G.T. 54-9, G.85-37 and F.153) significantly differed in stalk length, diameter and cane and sugar yields in the plant cane crops. They obtained the highest quantity of sugar in plant cane crops when sugarcane varieties were planted at 120 cm inter-row spacing. Mohamed and Ahmed (2002) showed that the differences among the examined varieties with respect to millable cane height, diameter, number of millable /m 2 and net cane yield were significant. The present work was conducted to find out the relative effect of row spacing on the productivity of some new promising sugarcane varieties grown in Upper Egypt.

MATERIALS AND METHODS The present work was conducted at El-Mattana Agricultural Research Station, Qena Governorate, Egypt, to find out the relative response of some promising sugarcane varieties to inter-row spacing in plant cane crops during 1999/2000 and 2000/2001 seasons. The study included 9 treatments represented the combination between three inter-row spacing (80,100 and 120 cm) and three promising sugarcane varieties (F.160, F.153 and Ph. 8013). A strip plots design with four replications was used. The subplot area was 42 m 2 (12 m in width and 3.5 m in length). Each plot contained 15, 12 and 10 ridges for the inter-row spacing of 80, 100 and 120 cm, respectively. Plant cane was planted during the 1st week of March in the two growing seasons. The recommended doses of nitrogen, potassium and phosphorus fertilizers (180 kg N, 50 kg k 2O and 30 kg P 2O5/fed were added). Phosphorus was applied during land preparation. Meanwhile, nitrogen was split into two equal doses; the 1st one was applied two months from planting and the 2nd one was added one month later. Potassium fertilizer was applied once with the 1st dose of nitrogen. All other agricultural practices for sugarcane fields were adopted as recommended. At harvest, a sample of 20 labeled stalks was taken at random from each plot to determine morphological characters and chemical properties. Data Recorded. 1. Number of plant/m 2 was counted at 60, 90 and120 days from planting. 2.Number of millable cane/m 2 was counted at harvest. 3.Millable cane height (cm) was measured from ground level up to dewlap. 4.Millable cane diameter (cm) was measured at the middle part of stalk. 5.Total soluble solids percentage (TSS%) was determined in the laboratory using Brix hydrometer.

6.Sucrose percentage in 100 cm 3 juice was determined using Sacharemeter according to A.O.A.C. (1995). 7. Net cane yield (tons/fed) was determined. 8. Sugar yield (tons/fed) was estimated according to the following equation: Sugar yield = cane yield (tons/fed) x sugar recovery %. Where: Sugar recovery percentage was calculated according to the following equation: Sugar recovery % = [richness % x purity %] x 100 Purity % = sucrose % / brix % x 100 Richness % = (sucrose/100 gm juice x richness factor) /100 Sucrose/100 gm juice = (sucrose/100 cm3 juice) / juice density Juice density was taken from Schibler table according to the Sugar Company. Richness factor (extracted juice) = 100 - [(Fiber % x 1.3) + 2.5] 1.3 = percent water free from sugar 2.5 = physical impurities % The collected data were subjected to proper statistical analysis according to procedures outlined by Snedecor and Cochran (1981). Treatment means were compared by Least Significant Difference (L.S.D.) at 5% level of probability.

RESULTS AND DISCUSSION 1. Number of plants/m 2 Results given in Table 1 showed that plant density in terms of row spacing between ridges significantly differed with respect to their influence on the number of plants/m2 at the various growth stages for plant cane crops. This result may be due to the relative benefit of the wide space that partially increased shooting process. In general, it is clearly shown that the wider the plant space, the higher the plant population/m 2. The third row spacing (120 cm) gave the highest plant density. This finding was true in the both seasons of plant cane crops. These results are in agreement with those obtained by Mohamed (1997). Concerning varietal effect on the values of plant density/m 2, the results cleared that the examined varieties significantly differed in plant density/m2. Sugarcane variety F.153 surpassed the studied varieties in the values of number of plant/m 2 followed PH.8013 and finally F.160 variety. This observation was true at the plant crop. Difference in this trait may be due to the gene make up influence on the number of plants/m 2 with respect to the examined varieties. These results are in line with those obtained by Taha (1983) and Misra and Mathur (1986). The interaction between inter-row spacing and varieties significantly affected plant density/m 2 at age of 60 in the both plant cane and at age of 90 days in the second plant cane. The highest value of plant population was recorded when variety F.153 was planted at 120 cm row spacing.

Table 1: Number of plants/m 2 at ages 60, 90 and 120 days as affected by inter-row spacing and varieties in 1999/2000 and 2000/2001 seasons Row spacing

F.160

80 cm 6.92 100 cm 7.35 120 cm 9.17 Mean 7.81 LSD at 5% level for: Row spacing (A) Varieties (B) AxB

Sugarcane varieties at 60 days age Plant cane (1999-2000) Plant cane (2000-2001) Ph Ph F.153 Mean F.160 F.153 8013 8013 8.30 7.67 7.63 12.28 14.99 13.05 8.40 7.64 7.80 13.00 17.03 13.75 11.92 10.35 10.48 14.62 18.73 16.12 9.54 8.55 13.30 16.92 14.31

80 cm 6.79 100 cm 7.36 120 cm 9.33 Mean 7.83 LSD at 5% level for: Row spacing (A) Varieties (B) AxB

9.38 9.56 12.30 10.41

1.29 0.81 0.88 At 90 days age 7.95 8.04 12.47 9.00 8.64 13.47 10.17 10.60 14.47 9.04 13.47

80 cm 8.48 100 cm 10.08 120 cm 12.10 Mean 10.22 LSD at 5% level for: Row spacing (A) Varieties (B) AxB

11.83 14.57 15.30 13.90

0..51 0.09 N.S At 120 days age 9.82 10.04 10.32 12.05 12.23 12.42 13.13 13.51 14.02 11.67 12.25 0.21 0.80 N.S

Mean 13.44 14.59 16.49

0.99 0.91 1.94 14.98 17.13 19.42 17.18

12.83 13.16 15.77 13.92

13.43 14.59 16.55

1.33 1.32 0.94 14.77 16.25 17.62 16.21

12.00 14.48 15.27 13.92

12.36 14.38 15.63

0.215 0.04 N.S

2- Number of millable cane/m 2 Results in Table 2 revealed that number of millable cane/m 2 at harvest was significantly affected by inter-row spacing for the two plant cane crops. Planting sugarcane varieties at 120 cm row spacing recorded the highest values of number of millable cane/m2 (14.83 and 16.40 millable cane plant/m2) for the 1st and 2nd season, respectively. These results are almost in harmony with the results reported by Mohamed (1997). The studied sugarcane varieties significantly differed in number of millable cane/m 2. This result was fairly true in both plant cane crops. The highest number of millable cane/m 2 at harvest was obtained from F.153 variety followed by Ph.8013 variety while the lowest number of this trait was recorded by F.160 variety. The differences between varieties with regard to millable cane number/m 2 are mainly genetically controlled and reflected in the capacity of this variety to produce more tillers and in turn increased their

survival till harvest compared to the other varieties. These finding are in accordance with those obtained by Misra and Mathur (1986) and Yousef et al. (2000). The results revealed that number of millable cane per square meter was significantly affected by the interaction between sugarcane varieties and inter-row spacing at the two plant cane corps. The maximum number of millable cane/m 2 (18.73 and 20.10 millable cane plant/m 2) was obtained by planting sugarcane variety F.153 at 120 cm inter-row spacing in the 1st and 2nd season, respectively. Table 2: Number of millable cane/m 2 as affected by inter-row spacing and varieties in 1999/2000 and 2000/2001 seasons Row spacing

F.160

80 cm 9.03 100 cm 9.41 120 cm 11.27 Mean 9.90 LSD at 5% level for: Row spacing (A) Varieties (B) AxB

Sugarcane varieties at 60 days age Plant cane (1999-2000) Plant cane (2000-2001) Ph Ph F.153 Mean F.160 F.153 8013 8013 12.23 9.33 10.20 9.03 12.00 9.33 12.73 11.83 11.32 10.27 13.07 12.73 18.73 14.50 14.83 13.13 20.10 15.97 14.57 11.89 10.81 15.06 12.68 1.29 0.81 0.88

Mean 10.12 12.02 16.40

0.99 0.91 1.94

3- Millable cane height: The results presented in Table 3 illustrated that the difference between the studied inter-row spacing were not enough to reach the level of significance with respect to their effect on stalk height for the two plant cane crops. This result are in harmony with that found by Mohamed (1997) and Abd El-Latif et al. (1999). Sugarcane varieties significantly differed in millable cane height in the 1 st nd and 2 seasons. Sugarcane variety F. 160 superiority over the other two varieties in millable cane height where it had 236.7 and 240.2 cm in the 1 st and 2nd season, respectively. These results are in line with that obtained by Misra and Mathur (1986). the interaction between sugarcane varieties and inter-row spacing insignificant affected millable cane height at the two plant cane corps. Table 3: Millable cane height (cm) as affected by inter-row spacing and varieties in 1999/2000 and 2000/2001 seasons Row spacing

Sugarcane varieties at 60 days age Plant cane (1999-2000) Plant cane (2000-2001) Ph Ph F.160 F.153 Mean F.160 F.153 Mean 8013 8013

2.40.0 80 cm 240.0 100 cm 230.0 120 cm Mean 236.7 LSD at 5% level for:

215.0 222.7 215.0

220.0 210.0 199.0

217.6

210.0

225.2 224.2 214.8

246.7 240.0 234.0

226.0 223.3 221.3

217.7 214.0 210.0

240.2

223.6

213.9

230.1 225.8 221.8

Row spacing (A) Varieties (B) AxB

N.S 10.5 N.S

N.S 16.1 N.S

4. Millable cane diameter (cm.) Data presented in Table 4 showed that millable cane diameter was significantly influenced by the inter-row spacing in the 2nd plant cane. Planting sugarcane varieties at 120 cm wide gave the thicker stalks compared with the other inter-row spacing. This result was in line with that reported by Prasad et al. (1983) and Abd El-Latif et al.(1999). Results revealed that sugarcane varieties significantly differed in the millable cane diameter in both plant cane crops. Sugaecane variety F.160 gave the thickest millable cane (2.99 and 3.02 cm) followed by Ph 8013 variety (2.96 and 3.00 cm) for the 1st and 2nd plant cane crop, respectively. Similar results were recorded by Taha (1983) and Yousef et al. (2000). Insignificant differences were recorded for the millable cane diameter as a result to the interaction between the sugarcane varieties and row spacing in the 1st and 2nd seasons. Table 4: millable cane diameter as affected by inter-row spacing and varieties in 1999/2000 and 2000/2001 seasons Row spacing

F.160

80 cm 2.99 100 cm 2.49 120 cm 3.03 Mean 2.99 LSD at 5% level for: Row spacing (A) Varieties (B) AxB

Sugarcane varieties at 60 days age Plant cane (1999-2000) Plant cane (2000-2001) Ph Ph F.153 Mean F.160 F.153 8013 8013 2.33 2.93 2.75 2.98 2.35 2.95 2.43 2.94 2.77 3.07 2.53 3.05 2.58 3.00 2.87 3.01 2.78 3.00 2.45 2.96 3.02 2.57 3.00 N.S 0.04 N.S

Mean 2.76 2.87 2.93

0.04 0.21 N.S

5. Brix percentage: Data illustrated in Table 5 revealed that differential inter-row spacing (80,100 and 120 cm) insignificantly affected juice brix % in both plant cane crops. These results are in agreement with those obtained by Devi et al (1990) and Abd El-Latif et al. (1999). Table 5: Brix percentage as affected by inter-row spacing and varieties in 1999/2000 and 2000/2001 seasons Row spacing

F.160

80 cm 21.85 100 cm 21.48 120 cm 21.64 Mean 21.66 LSD at 5% level for:

Sugarcane varieties at 60 days age Plant cane (1999-2000) Plant cane (2000-2001) Ph Ph F.153 Mean F.160 F.153 8013 8013 21.16 21.06 21.36 21.27 20.63 19.69 21.77 21.73 21.66 20.97 20.05 20.15 20.41 22.40 21.36 21.39 19.07 20.57 21.11 21.61 21.21 19.92 20.13

Mean 20.53 20.39 20.30

Row spacing (A) Varieties (B) AxB

N.S N.S 1.27

N.S 0.83 1.77

Once more, data collected in Table 5 pointed out that brix percentage was markedly affected by sugarcane varieties in the 2 nd plant cane crop. Sugarcane variety F.160 surpassed the other varieties in brix % followed by Ph.8013 and F.153 variety. The differences between the studied varieties with respect to brix value may be mainly due to gene make-up the differences, in addition to, the surrounding environmental conditions prevailing during the formation period of soluble solids. Ahmed (1995) and Ahmed (1998) reported differences between sugarcane varieties. The interaction between the two studied factors significantly affected on brix % in the 1st and 2nd plant cane crops. Planting sugarcane variety F.160 at 120 cm row spacing recorded the highest value of brix % compared with the other two varieties. 6. Sucrose percentage: The collected data in Table 6 showed that there were no statistical differences in sucrose % due to the studied inter-row spacing. This results may be assured that such character mainly affected by gene make up. These results are harmony with those obtained by Devi et al. (1990) and patil et al. (1990). Data recorded in the same Table showed that sugarcane varieties significantly differed in sucrose % in the two plant cane crops. Sucrose % of F.160 variety was slightly higher than the other two varieties. This finding was true in the 1st and 2nd seasons recorded 18.50 and 17.89%, respectively. The result is in line with those reported by Misra and Mathur (1986) and Ahmed (1998). Interaction inter-row spacing x varieties had a significant effect on sucrose % in both seasons. The highest sucrose percentage (18.50 and 17.89 %) was recorded when F.160 variety was planted at 120 cm apart. This result was fairly true for the first and second plant cane crop, respectively. Table 6: Sucrose % as affected by inter-row spacing and varieties in 1999/2000 and 2000/2001 seasons Row spacing

F.160

80 cm 18.40 100 cm 18.25 120 cm 18.50 Mean 18.38 LSD at 5% level for: Row spacing (A) Varieties (B) AxB

7. Net cane yield:

Sugarcane varieties at 60 days age Plant cane (1999-2000) Plant cane (2000-2001) Ph Ph F.153 Mean F.160 F.153 8013 8013 17.58 17.71 17.90 17.88 16.95 16.41 17.80 16.68 17.58 17.58 17.12 16.36 17.37 16.88 17.58 17.89 16.45 16.43 17.58 17.09 17.79 16.84 16.40 N.S 1.20 1.21

Mean 17.07 17.02 16.92

N.S 0.89 1.18

Results in Table 7 showed that net cane yield was gradually and significantly increased by increasing row spacing from 80 up to120 cm. This result was true in both seasons. It is worth mentioning that, inter-row spacing at 120 cm increased cane yield by 8.491 and 2.612 tons/fed, respec tively, in the 1st plant cane, corresponding to, 7.911 and 0.872 tons/fed in the 2 nd plant cane crop compared with the other two inter-row spacing (80 and 100 cm). The pronounced effect of the wider inter-row spacing may be due to the positive effect of those treatments on the number of millable cane as well as millable cane height and diameter. These results are in harmony with those obtained by Nandihalli and Singh (1982), Mali and Singh (1986) and Devi et al. (1990). Concerning varietal effect, results in Table 7 indicated that the examined sugarcane varieties significantly differed in net cane yield in the 1 st and 2nd seasons. It is cleared that net cane yield of Ph 8013 variety gave the highest cane yield (52.160 and 54.923 tons/fed) in the 1 st and 2nd plant cane crop, respectively. Many investigators i.e. Yousef et al. (2000) and Mohamed and Ahmed (2002) reported the effective role of varieties on cane yield. The interaction between the studied factors had insignificant effect on net cane yield in both seasons. Table 7: Net cane yield as affected by inter-row spacing and varieties in 1999/2000 and 2000/2001 seasons Row spacing 80 cm 100 cm 120 cm Mean

Sugarcane varieties at 60 days age Plant cane (1999-2000) Plant cane (2000-2001) Ph Ph F.160 F.153 Mean F.160 F.153 Mean 8013 8013 44.280 49.280 53.087

42.467 46.543 50.412

46.400 54.960 55.120

48.882

46.474

52.160

LSD at 5% level for: Row spacing (A) Varieties (B) AxB

44.382 50.261 52.873

3.757 3.562 N.S

47.150 54.000 56.783

45.200 51.600 51.197

49.600 57.467 57.703

52.644

49.332

54.923

47.317 54.356 55.228

4.217 5.015 N.S

8. Sugar yield: Data presented in Table 8 showed that sugar yield was significantly affected by row pacing in the two plant cane crops. Increasing row spacing from 80 to 100 and/or 120 cm increased sugar yield of the 1 st plant cane by 11.39 and 17.38 %, corresponding to 15.08 and 17.11% for the 2 nd plant cane respectively. The increase in sugar yield essentially due to the increase in the vegetative growth such as stalk height and diameter (Tables 3 and 4) and net cane yield (Table 5). These results are in agreement with those obtained by Nandihalli and Singh (1982) and Prasad et al.(1983). The obtained results in Table 8 showed that the studied varieties significantly differed with respect to their sugar yield at the 2 nd plant cane crop. It is cleared that F.160 variety gave the highest value of sugar yield (6.269 tons/fed) compared with the other two varieties (F.153 and Ph.8013).

Increasing sugar yield mainly due to an increase of sucrose % of this variety. This result is in line with those obtained by Taha (1983) and Mohamed and Ahmed (2002). Sugar yield was significantly affected by the interaction between varieties and row spacing. This result was true in the both plant cane crops. In general, F.160 variety planted at 120 cm apart recorded the highest quantity of sugar yield. Table 8: Sugar yield as affected by inter-row spacing and varieties in 1999/2000 and 2000/2001 seasons Row spacing

F.160

80 cm 5.507 100 cm 6.100 120 cm 6.667 Mean 6.091 LSD at 5% level for: Row spacing (A) Varieties (B) AxB

Sugarcane varieties at 60 days age Plant cane (1999-2000) Plant cane (2000-2001) Ph Ph F.153 Mean F.160 F.153 8013 8013 5.043 5.177 5.242 5.573 5.077 5.467 5.150 5.907 5.839 6.417 5.913 6.227 5.840 5.953 6.153 6.827 5.773 6.273 5.464 5.679 6.269 5.588 5.989 0.063 N.S 0.372

Mean 5.372 6.182 6.291

0.909 0.520 1.284

REFERENCES Abd El-Latif, F.A.; L.M. Saif and A.M.A El-Shafai (1999). Optimum row spacing and nitrogen level for the plant cane and ratoon of the new promising sugarcane variety F.153. Egypt.J.Res., 77(2): 769-782. Ahmed, A.M. (1995). Evaluation of some sugarcane varieties grown in Upper Egypt. M.Sc. Thesis, Fac. Agric., Al-Azhar Univ., Cairo, Egypt. Ahmed, A. Z. (1998). Evaluation of some sugarcane varieties under nitrogen fertilization levels and seeding rates. Ph.D. Thesis, Fac. Agric., Minia Univ., Minia, Egypt. A.O.A.C. (1995). Official methods of analysis. published by the A.O.A. C., Box 540, Woshington, D.C. Devi, C.; K.L. Rao and D.V.M. Raju (1990). Studies on the effect of row space and nitrogen on yield and quality of early maturing sugarcane varieties. Indian Sugar, 40 (7): 541-544. Mali, A.L. and P.P. Singh (1986). Effect of varying row spacing on the yield of selected varieties of sugarcane. Indian sugar. 36(3): 117-121. Misra, A. and P.S. Mathur (1986). Effect of plant density and fertility levels on yield and quality of ratoon raised from winter harvested sugarcane. Indian sugar of Agronomy, 31(2): 172-176. Mohamed, M.B. (1997). Inter-cropping of some summer crops on spring sugarcane. M.Sc. Thesis, Fac. Agric., Minia Univ., Minia, Egypt.

Mohamed, B.D. and A.M.A. Ismail (2002). Response of three sugarcane varieties to varying inter-row spacing and application time of nitrogen fertilizer. Egypt. J. Appl. Sci., 17 (2): 102-116. Mohamed,B.D. and A.Z. Ahmed (2002). Influence of planting seasons and nitrogen fertilizer levels on productivity of three sugarcane varieties. Egypt. J. Appl. Sci., 17 (3): 64-77. Nandihalli, U.B. and J.N. Singh (1982). Note on the effect of row spacing and degree of defoliation on yield and quality of cane. Indian J. Agric. Sci., 52(1): 26-27. [C.F. Hort. Absts., 1983, 53(7): 5577]. Patil, H. S.; N.J. Mehta; M.P. Pati and B.C. Naik (1990). Effect of row spacing and nitrogen levels on yield and quality of early maturing sugarcane cultivars. Indian sugar, 5(8): 609-611. Prasad, D.; U.K. Prasad and P.K. Bose (1983). Effect of pre-monsoon irrigation, nitrogen and spacing on the yield of sugarcane varieties. Indian J. Agric., 28(2): 131-133 [c.f. Hort. Absts., 1985, 55(2):1625]. Snedecor, G.W. and W.G. Cochran (1981). Statistical Methods. Oxfored and I.B.H. puplishing G. 6th Ed., 299-310. Taha E.M. (1983). Effect of levels of nitrogen fertilization and method application on growth, yield, yield component and characteristics of two sugarcane varieties. Ph.D. Thesis, Fac. Agric., Minia Univ., Minia, Egypt. Yousef, M.A.; E.M Taha and A.Z. Ahmed (2000). Influence of some cultural practices on yield and yield components of some sugarcane varieties. Egypt. J. Res., 75(5): 1995-2009.

‫عالقة مسافة التخطيط مبحصول وجودة بعض أصناف قصب السكر املبشرة‬ ‫أمحد زكى أمحد – السيد أمحد السيد نعمت هللا – أمحد حممد أمحد امساعيل‬ ‫ مصر‬- ‫معهد حبوث احملاصيل السك رية – مركز البحوث الزراعية – جيزة‬ ‫ و‬2000 /1999 ‫أقيمت تتت ا ربت ت تتا حطةيتت تتا مبحط ت تتة البح ت تتوث الزراعيت تتة ملطاعن ت تتة مبحاف ت تتة قنت تتا م ت تتالل م ت تتومسى‬ ‫ وذلت لدراةتة ري تتد معتدل التخطتيط وا صتتناف عةتى كميتة احملصتتول وصتلاق ا تودة حملصتتول قصتب الستكر وقتتد‬2001 / 2000 ‫ ةتتلىف م‬120 ‫ و‬100 ‫ و‬80

‫اةتتخد صصتتميل الش ت راتع املتعامتتدة م أربتتح مكتترراق حيتتم وفتتعت التتوالث مستتافاق ب ت ا طتتو‬

‫( م الططتتح الشتطية أوفتتحت النتتتاتمل املتحصتل عةي هتتا متتا‬F.160, F.153, Ph.8013) ‫الططتح ال رتيستتية وا صتناف الوال تتة‬ :‫يةى‬ ‫ يومتتا متتز الزراع تتة و‬120 ‫ و‬90 ‫ و‬60 ‫ أ تترق املستتافة ب ت ا طتتو و تدا معن تتوب عةتتى عتتدد النبتتاوق لةم ت امل رب تتح عنتتد أعمتتار‬1 ‫ ةتتل بت ا طتو أعةتتى‬120 ‫ وقتد اعطتتى معتدل التخطتيط‬- ‫كتلل م عتدد العيتدا الطابةتتة لةعصتد وحمصتول العيتتدا و كميتة الستكر‬ ‫قيل لتة الصلاق مطارنة ملعد ق ا مرى‬ ‫ م ارصلتتاو ومس ت العيتتدا الطابةتتة‬F.160

‫ صباينتتت انصتتناف فيمتتا بين هتتا معنتتوب م يتتح الصتتلاق املدروةتتة وقتتد صلتتو الصتتن‬2 ‫لةعصد و النسبة املئوية لةربكس والسكروز وحمصول العيدا والسكر لةلدا‬

‫حتتت رتروف اتلا البحتم يوصتى بزراعتة صتن‬ ‫أعةى حمصول عيدا وةكر لةلدا‬

‫قصتب الستتكر ‪ F.160‬م مطتو بعتر‬

‫‪ 120‬ةتل لةحصتول عةتتى‬