Effect of phosphorus application rates on sunflower growth and soil microflora in severe saline land

LU Chuang1, PANG Huan-cheng1, ZHANG Jian-li2, YAN Shou-wei2, WANG Jing1, LI Yu-yi1* (1.Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2.School of Life Science, Beijing Institute of Technology, Beijing 100081, China) Abstract:We conducted barrel planting experiment to investigate the leaf protective enzymatic activities, dry matter accumulation, P uptake of sunflower and the variation characteristics of microflora in soils with different levels of P supply. Four P treatments was implemented in原 cluding CK(0 kg·hm-2), P4(60 kg·hm-2), P8(120 kg·hm-2)and P12(180 kg·hm-2). The results showed that applying P significantly im原 proved sunflower leaf protective enzymatic activities, and the leaf SOD and CAT activities were significantly increased when the P applica原 tion reached P4 level, further increase at P12 level, but POD activity was significantly increased only when reached P12 level. The leaf MDA 摘 要:采用大田筒栽试验,设置 4个施磷(P2O5)水平:CK(不施磷)、P4(60 kg·hm-2)、P8(120 kg·hm-2)、P12(180 kg·hm-2),研究了重