The Influence of Sowing Date on Growth, Yield and Qualityof Sugar Cane
الملخص
This study was conducted within the commercial field of New Halfa Sugar Scheme, during the period October 1994 to September 1996 to determine the influence of sowing date on sugar cane growth, yield and quality. Climatic elements including temperature, percent relative humidity (%RH) and total rainfall were obtained from Halfa meteorological substation. Soil moisture and actual evaportranspiration (ET( during the growth period were measured. Penman evaporation (E (was calculated. Gernnination percentage, plant population, plant height, stalk thickness, number of intenodes per stalk, fresh and dry mutter content, pithyness, flowering percentage, brix ( %), purity (%), pol (%), recovery and fiber (%) were determined. The results showed that July and October planting dates were of signi- ficantly higher values for the different aspects of thermal time, crop factors, germination (%(
tiller-ing, (%), plant height, dry matter production, final yield and sugar quality as compared to the late sowing date in March. Pithyness was associated with March planting and decreased with July planting Flowering occurred only in the crop planted in March. The water requirements of the crop differed from the existing indenting system where about 18.6 m3 /feddn(f)/day were required during initial stage, 24.3 m3/ f/day were required during the development stage, 41.28 /m3/f/day were required during the mid season stage and 25.8 m3/f/day were required during the late season stage whereas 31,6 m3/f/day were required as an average for the whole cycle of cane plant. Sugar cane crop required about 314, 1274, 3092 and 4204 accumulated degree days for initiation, development, mid season and maturity, respectively, for optimal productivity. The late planting date in March exposed the crop to harmful effects of heat stress resulting in poor germination and low yield.
المراجع
Adam, H.S. 1992. Use of agroclimatic data for effective irrigation of sugar cane. Paper presented for the irrigation management siminar, Kenana Sugar Company, Sudan.
Chang, J.H. 1979. The effect of irrigation on evapotranspiratior in both plant and ratoon crop of sugar cane. Indian Journal of Agriculture 3:22-26.
Edwards, E. and J. G. Paxton. 1979. Effect of photoperiod and temperature on the rate of elongation of sugar cane leaf sheaths. Proceding, of South Africa Sugar Technology Association 53: 163-164.
Fadl, O.A.A. 1977. Evapotranspiration measured by a Neutron probe on Sudan Gezira vertisols. Annual Report of the Gezira Research Station and Substations, pp. 126-129, Wad Medani, Sudan.
Farbrother, H.G.1973. Water requirements of crops in the Gezira Annul Report of the Gezira Research Station, 1972-73, pp. 39- 72 ,Wad Medani, Sudan.
FRCPS. 1992. Final report of the committee for pithiness on in sugar cane. Kenana Sugar Cane Company Limited, Kenana' Sudan.
Garcia—Hiudobro J. , J. L. Monteith and G.R. Squire. 1982. Time, temperature and germination of Pearl Millet. l. Constant temperature
Journal of Experimental Botany 33: 288-96
Mohanuned, A.E. 1987. Annual report of Gunied Sugar Research. Station. 1986/87, PP. 10-15, Agricultural Research Corporation Wad Medani, Sudan.
Mohamed, H.A., J.A. Clark and C.K. Ong. 1988. Seedling emergence and leaf growth of groundunt (Arac/lis Hypogclea L.) and pearl millet (Pennisetum typhoicdes). Journal of Experimental Botany 39:1129-1135.
Mirghani, F. S. 1994. Crop water requirements of sugar cane in Gunied Sugar Scheme. M.Sc. thesis submitted to University of Gezira Wad Medani, Sudan.
Spencer, G.L. and G. P, Meade 1964. Cane Sugar Hand Book. John Willy and Sons, New York.
Penman, H. L. 1948. Laboratory experiments on evaporation from fallow
soil. Journal of Agricultural Science 31: 45 1-456
Yang, hang, S. J. 1976. Influence of soil moisture on sugar cane production. Taiwan sugar 23: 161-166.
