论文部分内容阅读
以郑单958为试验材料,采用裂区试验设计,研究吉林东部半山区玉米-大豆轮作、连作及4个氮肥水平(0kg/hm2(F1)、90kg/hm2(F2)、180kg/hm2(F3)和270kg/hm2(F4))对玉米农艺性状及产量的影响。结果表明,轮作处理在干物质积累、叶面积、叶面积指数及籽粒产量方面均优于连作处理,而对其他产量构成因素并未形成优势;F3、F4处理在株高、相对叶绿素含量(SPAD)、叶面积指数、产量构成及产量等指标均显著高于不施氮肥的F1处理(P<0.05),高水平氮素(F3、F4)投入对穗粗、百粒重和籽粒产量有一定促进作用,降低了秃尖长度,对行粒数及穗行数影响不明显(P>0.05);F3、F4处理较F1处理籽粒增产幅度达18.45%和16.52%。为此,在吉林东部半山区玉米轮作系统的氮肥施用量以180kg/hm2左右为最佳。
Taking Zhengdan 958 as experimental material, the experimental design of fissure area was used to study the effects of maize-soybean rotation, continuous cropping and four nitrogen fertilization levels (0kg / hm2 (F1), 90kg / hm2 ) And 270kg / hm2 (F4) on the agronomic traits and yield of corn. The results showed that rotation treatment was superior to continuous cropping in terms of dry matter accumulation, leaf area, leaf area index and grain yield, but not for other yield components. The plant height and relative chlorophyll content (SPAD ), Leaf area index, yield components and yield were significantly higher than those without F1 (P <0.05). High level of nitrogen (F3, F4) had a certain effect on ear diameter, 100-grain weight and grain yield (P> 0.05). The grain yield of F3 and F4 was 18.45% and 16.52% higher than that of F1. For this reason, the nitrogen fertilizer application rate in the corn rotation system in the semi-mountainous area in the east of Jilin is about 180kg / hm2.