氮磷钾肥配施对腰果红带蓟马发生为害的影响
张中润；梁李宏**； 黄伟坚；梅 新 ；王金辉
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作者单位：中国热带农业科学院热带作物品种资源研究所 海南儋州 571737
中文关键词：腰果， 红带蓟马， 氮磷钾肥， 蓟害指数， 相关性
英文关键词：cashew, redbanded thrip, fertilizer, damage index, correlation
中文摘要：研究氮磷钾配施对腰果红带蓟马Selenothrips rubrocinctus（Giard）发生为害的影响。结果表明， N3P 3 K 2和N3P2K1处理的抗虫能力最高，其蓟害指数显著低于其他处理，分别为3.10%和8.30%，N3P1 K3和N2 P3 K1处理也有较强的抗虫能力，蓟害指数分别为20.40%和20.30%，而N1P2 K2 处理的抗虫能力最低，其蓟害指数为54.00%，显著高于N3 P3 K2，N3 P2 K1，N3 P1 K3，N2 P3 K1和N2 P1 k2处理。植株冠幅方位对红带蓟马发生为害的影响差异不明显，说明光强度对腰果红带蓟马的发生为害影响不显著。研究表明，腰果叶片含氮量在1.43%～1.72%范围内，叶片氮素含量与腰果蓟害指数呈极显著的负相关。
英文摘要：Effects of fertilizers with different ratios of nitrogen, phosphorus and potassium on the infestation of cashew redbanded thrip Selenothrips rubrocinctus （Giard） were studied. Three levels of N, P and K were designed. The results showed that treatments N3 P3 K2 and N3 P2 K 1 had the highest resistance to redbanded thrips, with the damage index 3.10% and 8.30% respectively, which were significantly lower than those of other treatments. Treatment N3 P1 K3 and N2 P3 K1 also showed higher resistance, with the damage index 20.40% and 20.30% respectively. Treatments N1 P2 K2 showed the lowest resistance to redbanded thrip, with the damage index 54.00%, which was significanty higher than those of other treatments. The damage of redbanded thrip on different orientation of a plant was not different, which indicated that light density had no significant effect. The results demonstrated that there was significantly negative correlation between nitrogen content and damage index caused by redbanded thrip on cashews when the nitrogen content ranged from 1.43% to 1.72%.