Integrated Project for Water Management and Soil Salinity, Rajendranagar, Hyderabad-500030, Andhra Pradesh
*Present address: Agricultural Research Station, Rudrur 503188, Andhra Pradesh
A field study on red sandy loam soil was conducted to find out the influence of four different irrigation levels (based on climatological approach) on the movement, distribution pattern in the soil and uptake of applied phosphorus and potassium with potato as the test crop. The movement of P was insignificant and it was up to 15 to 30 cm only under higher moisture levels. Potassium moved into the soil at all irrigation levels at irrigation water/cumulative pan evaporation (IW/CPE) ratio of 0.60 to 1.05 and there was greater movement to lower depths (30 - 45 cm) under higher levels of irrigation. The crop uptake of P and K was greatly facilitated at IW/CPE ratio of 1.05 The yield of potato increased with IW/CPE ratio increasing from 0.60 to 1.05.
Irrigation level, movement of P and K, red sandy loam soil, potato
