论文部分内容阅读
1978～1980年在三种地力水平下对两个早熟单交种玉米的研究结果表明,麦茬夏玉米干物质积累和对氮、磷、钾吸收的进程,同春播玉米及套种玉米大体上相似。最大的差别是,夏玉米出苗后就进入高温多雨的季节,前期生育快,干物质积累及养分的吸收量都大大超过春玉米和套种玉米,故氮化肥应该早施、重施。
From 1978 to 1980, the results of two cultivars of precocious maize at three soil fertility levels showed that dry matter accumulation and the absorption of nitrogen, phosphorus and potassium in summer maize were similar to those of sowing spring and intercropping corn. The biggest difference is that the summer maize after entering the hot and rainy season, pre-fast birth, dry matter accumulation and nutrient uptake are greatly exceeded spring maize and intercropping corn, nitrogen fertilizer should be early Shi, re-Shi.