Effect of irrigation frequency and nitrogen on groundnut yield and nutrient uptake |
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Authors: | S Rami Reddy P S Chalam G H Sankara Reddi A P Raju |
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Institution: | (1) Department of Agronomy, Andhra Pradesh Agricultural University, Tirupati Campus, 517 502, India |
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Abstract: | Summary Field experiments were conducted during 1979 and 1980 summer seasons on sandy loam soils of low moisture retentive capacity
to study the effect of high frequency irrigation at different levels of N on groundnut yield and nutrient uptake (NPK).
Four irrigation frequencies (irrigation at 2, 4, 6 and 8 cm cumulative can evaporation, corresponding to irrigation once in
3, 5, 7 and 10 days respectively) and four levels of nitrogen (0, 20, 40 and 60 kg N/ha) were tested in a factorial randomized
block design with three replications.
Pod yield of groundnut was maximum (3,293 kg/ha) when irrigations were scheduled at 4 cm cumulative can evaporation (once
in 5 days). Addition of N did not increase the pod yield. N and P uptake by the crop was maximum (180 kg N and 18 kg P/ha)
with high frequency irrigation of scheduling irrigation at 4 cm cumulative can evaporation. Highest uptake of N (183 kg/ha)
and P (19 kg/ha) was with a combination of 20 kg N/ha and high frequency irrigation (4 cm CCE). K uptake was low with low
irrigation frequency, while it was highest (67 kg K/ha) at 20 kg N/ha. |
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Keywords: | Available soil moisture Can evaporimeter Cumulative can evaporation High frequency irrigation Scheduling irrigation Uptake of nutrients |
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