Effect of irrigation and nitrogen fertilization on yield, quality, nutrient uptake and water use of onion (Allium cepa L.)
1988
Hedge, D.M. (Indian Institute of Horticultural Research, Bangalore (India). Div. of Soil Science)
Studies carried out at the Indian Institute of Horticultural Research, Bangalore during winter seasons of 1982-83 and 1983-84 indicated that irrigation at 0.45 to 0.65 bar soil water potential measured at 8 cm depth resulted in maximum bulb yield and water use efficiency (WUE) of onion but the quality of bulbs was not much affected by irrigation treatments. Frequent irrigations at high soil water potential tended to decrease or failed to change the concentrations of N,P,K,Ca and Mg in leaves and bulbs but their uptake generally increased due to higher dry matter production. Evapotranspiration (ET) of the crop increased with irrigations at increasing soil water potential. Nitrogen fertilization increased bulb yield, harvest index, ET and WUE. The quality of bulbs was not much influenced by N fertilization. There was increase in N,Ca and Mg concentration and decrease in P and K concentration with N application. The uptake of all the nutrients, however, increased with N fertilization
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