Effect of NPK fertilization and plant population on seed yield of sudangrass (Sorghum sudanense "Piper" Stapf)

Soad H. Mohamed, Ali S. Gangi, Ibrahim E. Mohamed


This study was conducted to determine the effects of four plant populations, four levels of NPK fertilizer and their interacions on summer and winter seed yield of sudangrass (Sorghum sudanense "Piper" Stapf). Lower plant population of 8 plants per m2 (one plant/hole) coupled with 240 kg NPK/ha, which is equivelant to 1N, significantly increased number of panicles/plant, number of seeds/panicle, 1000-seed weight and final seed yield of sudangrass. Plant height and dry matter yield were increased when either one plant or three plants/hole were coupled with 240 kg NPK/ha. The highest seed yield (7.13 t/ha) of sudangrass was achieved from the main crop during the summer season when 8 plants/m2 (one plant/hole) were used with 240 kg NPK/ha. However, the highest air dry matter yield (11.25 t/ha) was obtained when the fertilizer rate of 240 kg NPK/ha and a plant population of 16 plants/m2 (2 plants/hole) were used. It is recommended that the crop should be sown during the summer season with a plant population of 80000 plants/ha (8 plants/m2, i.e. one plant per hole), coupled with 240 kg NPK/ha for seed production.

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