沿江稻区多熟制春玉米两段覆膜种植技术

根据长江下游沿江稻区多熟制生产的自然生态特点，以春玉米露地移栽和地膜直播为对照，研究了营养钵育苗两段覆膜新型种植方式下春玉米的生育特点及其高产技术途径。结果表明春玉米两段覆膜种植具有增产与早熟的显著特征。春玉米的主要生长发育特性为大田初期株高日增量大，叶片早生快发，生长旺盛；中期植株叶面积多且高峰稳定期长，叶面积系数大，光合势强；后期干物质积累量多，贮藏物质向穗部运转效率高，穗大粒多粒重。通过产量函数数学模型的建立和寻优，探明了春玉米两段覆膜方式的最大生产潜力和高产技术优化组合。玉米产量8250kg／hm

Cultivation Techniques for Multi-cropping Spring Maize with Plastic Film Covered at Two Stages in Paddy Region along Yangtze River

According to the naturally ecological characteristic of multiplecropping system of paddy region along lower Yangtze River，growth and developmental characteristic and high-yielding cultivation techniques for spring maize with plastic film covered at two stages were studied through comparison with the other two cropping patterns（CK） of outdoor transplantation and direct sowing with plastic film．Spring maize with plastic film at two stages were markedly characterized by yield increase and early maturation．The main growth and developmental characteristics of spring maize were shown as follows：higher plant height increment per day and exuberant growth of leaves in the early stage；larger leaf area，longer leaf area increase period，higher leaf area index and stronger photosynthetic potential in the middle stage；more dry matter accumulation，higher transportion efficiency，bigger panicles，more grain no．and weight in the last stage．Based on yield mathematics model，high yield potential and high-yielding techniques of spring maize with plastic film covered at two stages were analysed．Agronomic measues for spring maize with yield more than 8 250 kg／hm2 were 7.92×104～8.99×104／hm2 planting density，288.6～352.4 kg／hm2 N （pure N）fertilezer application and 304.6×10-6～498.0×10-6 ethylene．