Effects of urea-N fertilizer dosage supplemented with Ipil-Ipil tree litter on yield of rice and insect prevalence

作     者：M. R. Abdullah K. L. Hossain 

作者机构：Former graduate student Department of Agroforestry Bangladesh Agricultural University Mymensingh Mymenisngh-2202 Bangladesh Department of Agroforestry Faculty of Agriculture Bangladesh Agricultural University Mymenisngh-2202 Bangladesh 

出 版 物：《Journal of Forestry Research》 (林业研究（英文版）)

年 卷 期：2006年第17卷第4期

页      面：335-338页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

主　　题：水稻 氮肥用量 产量 害虫流行 印茄 合欢 树叶 枯枝落叶 绿肥 

摘      要：The present study was undertaken to determine the effects of different levels of urea-N fertilizer in addition to ipil-ipil tree litter on yield of rice and insect prevalence. The field study was conducted at the Agroforestry Field Laboratory, Bangladesh Agricultural University, Mymensingh during July-December 2004. The treatments included 0, 90, 180, and 270 kg urea per hectare. All four treatments received five tons ipil-ipil tree litter per hectare. The experiment was laid out in a randomized complete block design (RCBD) with four replications. The results showed that the different treatments significantly influenced the yield and yield component viz. total tillers/hill, effective tillers/hill, filled grains and unfilled grains/panicle. The highest yield of 4.62 t·hm-2 with an increase of 21.57% over the control was recorded in treatment 180 kg urea·hm-2, which was statistically similar to treatment 90 kg urea·hm-2. The prevalence of insects viz. green leafhopper, brown plant hopper, rice bugs, leaf folder and stem borers were mostly correlated with N-levels. The prevalence of insects in general gradually increased with the increase of N. Therefore, this study suggests that the combined application of organic materials (tree litter of ipil-ipil) and N-fertilizer of 90 kg·hm-2 may produce good yield while minimizing insect prevalence in the rice field.