中国生态农业学报2017，Vol.25Issue(5)：677-688,12.DOI:10.13930/j.cnki.cjea.170222
硅、磷配施对玉米苗期生长及氮磷钾积累的影响
Effect of phosphorus and silicon application on the uptake and utilization of nitrogen, phosphorus and potassium by maize seedlings
摘要
Abstract
This study tested the effect of three levels of phosphorus (P) [1.0 mmol(P)·L-1(P1.0), 0.1 mmol(P)·L-1(P0.1) and 0.01 mmol(P)·L-1(P0.01)] and three levels of silicon (Si) [1.5 mmol(Si)·L-1(Si1.5), 0.75 mmol(Si)·L-1(Si0.75) and 0 mmol(Si)·L-1(Si0)] on a range of characteristics of 'Zhenghong 2' and 'Zhenghong 115' maize cultivars. The study analyzed dry matter, leaf area, root mor-phology and NPK contents of maize to determine the effects of the combined application of Si and P on maize root growth, dry mat-ter accumulation and NPK accumulation and utilization at seedling stage. The results indicated that P deficiency not only suppressed maize seedling growth, but also decreased root length, root volume, root surface area, leaf area, NPK assimilation and dry matter accumulation, and the effects were strengthened with decreasing P concentration. The enhanced maize root-to-shoot ratio at seedling stage increased the distribution rates of P and N in root system and the accumulation efficiency of NPK in dry matter, which im-proved the adaptation of rice to P-deficient environments. P deficiency stress enhanced root growth and P absorption and accumula-tion more in 'Zhenghong 115' than in 'Zhenghong 2' maize cultivar. However, the distribution rate in the root system of 'Zhenghong 115' maize cultivar increased substantially under P deficiency. Si accelerated maize root growth, increased NPK accumulation, im-proved the distribution rate of NPK in aboveground system, increased leaf area and dry matter accumulation under normal P condi-tion (P1.0). Under medium P deficiency (P0.1), the application of Si alleviated P deficiency stress through increasing NPK accumula-tion in maize seedlings, furthermore, it also accelerated growth of both root and shoot system. Under severe P deficiency (P0.01), the application of Si had no significant effect on root growth and dry matter accumulation, but it increased the PK accumulation in root system. It was therefore concluded that there existed significant synergetic and coordination effects of P and Si on beneficial traits of maize at seedling stage.关键词
玉米/苗期/硅磷配施/养分积累/养分利用/干物质积累Key words
Maize/Seedling stage/Combined phosphorus and silicon application/Nutrient accumulation/Nutrient utilization/Dry matter accumulation分类
农业科技引用本文复制引用
张嘉莉,朱从桦,豆攀,马晓君,王兴龙,孔凡磊,袁继超..硅、磷配施对玉米苗期生长及氮磷钾积累的影响[J].中国生态农业学报,2017,25(5):677-688,12.基金项目
国家科技支撑计划项目(2012BAD04B13-2)、公益性行业(农业)科研专项(20150312705)和国家重点研发计划(2016YFD0300307)资助 Supported by the National Key Technologies R&D Program of China (2012BAD04B13-2), the Special Fund for Agro-scientific Research in the Public Interest of China (20150312705) and the National Key Research and Development Project of China (2016YFD0300307). （2012BAD04B13-2）
