Studies, 1: to determine the optimum quantity and frequency of application of irrigation water in wheat cultivation and 2: to determine the efficiency of fertilizer P utilization by wheat in Bangladesh soils using tracer techniques
1980
Habibullah, A.K.M. | Rahman, S.M. | Enayetullah, M. | Biswas, M.R. | Idris, M.
An experiment was conducted to determine the response of wheat to different levels of phosphate fertilizer using P32 labelled triple-super-phosphate. The experiment was a split-plot design with irrigation treatments in the main plots and phosphorus treatments in the sub-plot. There were three levels of phosphate application e.g. 0, 60 and 120 Kg P205/ha. There were seven water treatments. Irrigation water was applied on the basis of deficit in moisture content obtained by neutron reading from the field capacity level. Plant samples were harvested at maximum tillering, booting, grain filling and final harvesting stage. P32 counts were taken and total P was determined. The data in grain yield and straw yield of wheat showed that the effect of irrigation intensity and frequency was insignificant. The percentage of P derived from fertilizer by wheat plants varied between 57.8 and 72.9 due to irrigation treatments. Single application of 1 or 2 field capacity irrigation water at grain filling stage resulted in the highest uptake of fertilizer P. Application of super-phosphate 60 and 120 Kg P205/ha increased the grain yield and straw yield significantly. The contribution of fertilizer P in the plant was higher from 120 Kg P205/ha than that from 60 Kg P205/ha, the uptake of fertilizer P being 60.3 and 71.5% from 60 Kg and P205/ha treatments respectively.
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