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Uptake of nitrogen phosphorus potassium and yield of rainfed groundnut arachis hypogaea



Uptake of nitrogen phosphorus potassium and yield of rainfed groundnut arachis hypogaea



Fertilizer Research 4(4): 381-385



Experiments were conducted on sandy loam soils of Tirupati campus of Andhra Pradesh Agricultural University [India] for 2 rainy seasons of 1980 and 1981 to study the effect of split application of NPK fertilizers on Spanish bunch groundnut. The fertilizer doses were 40 N, 20 P and 40 K kg ha-1 in 1980 and 30 N, 10 P and 25 K kg ha-1 in 1981. In 1980, uptake of N (48 kg ha-1), P (7 kg ha-1) and K (37 kg ha-1) was maximum with the application of 10 N, 5 P and entire 40 K kg ha-1 as basal and 30 N and 15 P kg ha-1 at 30 days after sowing, leading to highest pod yield (0.76 t ha-1). In 1981, application of 20 N, 10 P and 25 K kg ha-1 as basal dose and 20 N kg ha-1 at 30 days after seeding resulted in highest uptake of N (114 kg ha-1), P (17 kg ha-1) and K (58 kg ha-1) and hence the pod yield (2.36 t ha-1). Differences in the uptake of NPK and pod yield in 1980 and 1981 was due to variation in total rainfall and its distribution during the crop period. Rainfall was equally distributed throughout the crop period in 1981, whereas there were 2 prolonged dry spells of more than 40 days in 1980.

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