Effects of potassium nutrition on growth, biomass and chemical composition of rice plants and on host-insect interaction
2002
Salim, M. (National Agricultural Research Centre, Islamabad (Pakistan). Rice Programme)
Effects of different levels of potassium (K) on the growth, biomass and chemical composition of rice plants and on biology and behaviour of whitebacked planthopper, Sogatella furcifera (Horv.) were determined through culture solution at 29 degree 21 degree centigrade day / night temperatures and 70% RH. At low level of K, plant height, number of tillers/hill, root growth and biomass of rice plants were significantly less than the plants grown in the standard culture solution (40 ppm K). However, further increase in the amount of K from 40 ppm to 200 ppm did not significantly increase the growth and biomass of rice plants. Increase in the application of K in the culture solution increased K but decreased N, P, Mg, Si, Zn and soluble proteins in the rice plants. Deficiency of K in rice plant increased intake and assimilation of food, honey dew excretion, growth index, adult longevity and population build up of S. furcifera. Application of high dose of K to rice plants decreased adult life and population build up of the insect.
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