Journal
CROP PROTECTION
Volume 23, Issue 11, Pages 1041-1048Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cropro.2004.03.005
Keywords
brown planthopper; pesticides; rice roots; uptake; nitrogen; phosphorus; potassium; grain filling
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Effects of different BPH densities and pesticide applications on the uptake of nitrogen (N), phosphorus (P) and potassium (K), by the root system were investigated using a hydroponics culture. Infestations of 30 BPH had a significant effect on the uptake function of the rice root. A high dose (225 g.a.i. ha(-1)) of jingganmycin reduced the uptake of P and K significantly, but there was little effect on the uptake of N. At a low dose (15 g.a.i. ha(-1)) of imidacloprid the uptake of P and K was promoted significantly. There was also a significant interaction effect between BPH density and pesticide treatments. Field experiment during rice-grain filling showed that both low and high doses of imidacloprid reduced active growth stage (Deltat) and maximum (K) of grain growth of superior grains significantly and a high dose reduced K and growth rate of inferior grains significantly. All doses of imidacloprid and jingganmycin significantly reduced accumulative grain weight during Deltat. A high dose of imidacloprid reduced the growth rate of inferior grains significantly. (C) 2004 Elsevier Ltd. All rights reserved.
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