Drip irrigation trial for cotton production using three levels of N-fertilizer
1998
Ganotisi, N.D. | Cruz, R.S. | Cosico, V.B. | Catedral, I.G. (Cotton Research and Development Inst., Batac, 2906 Ilocos Norte (Philippines))
Drip irrigation is a method used to provide water most efficiently by applying it at the right rate and practically only to the plant root area. It keeps soil moisture at a constant optimal level by renewing the water supply to the rootzone at the same rate it is used up. This result in low soil suction, facilitating water and nutrient intake by the plant and high soil hydraulic conductivity available to the roots, while the soil, on the other hand, is never saturated and good aeration is maintained at all times. Six double row furrows (100 x 50 cm) by 10 m long were laid out in an [randomized complete block design] RCBD with three replications in a well prepared field. Cotton seeds were sown and a basal fertilizer of 50-50-50 kg/N-P2O5-K20 applied at planting. The remaining nitrogen fertilizers for the treatments of 100, 200 and 300 kg/ha were divided into nine parts and drip fertigated weekly starting 42 DAE. Results showed that drip irrigated cotton produced a potential yield of 4,811, 6,040, and 6,524 kg/ha under fertilizer level of 100-50-50, 200-50-50 and 300-50-50 kg NPK per hectare, respectively. Increase in fertilizer also caused a corresponding increase in plant height and number of bolls. Significantly higher earliness index was obtained at lower N-level but lint recovery and seed index were not affected. Partial budget analysis also showed that drip irrigation for cotton had a great advantage over the conventional furrow irrigation method
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