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采取耕作方式×种植密度×品种三因素裂区试验,深松40 cm和旋耕15 cm耕作条件,在9.0万株/hm~2和10.5万株/hm~2种植密度下,对中系郑单958和登海618、美系先玉335和华美1号、德系KX3564和KWS2564不同血缘玉米品种的地上部形态、生理及产量构成指标进行对比分析。结果表明,深松可降低增密后玉米净光合速率、LAI、SPAD值和单株生产能力的下降幅度,缓解株型的变化,提高玉米的耐密性。我国玉米品种的耐密性对深松耕作响应与美系和德系玉米品种存在差异,深松耕作与旋耕相比,华美1号、KX3564、KWS2564、先玉335增加种植密度后,其穗位叶叶倾角、净光合速率、LAI、SPAD值下降缓慢,产量、耐密系数显著提高,其耐密适应性对深松耕作的响应度高于郑单958、登海618。
Tillage patterns × planting density × three-factor split trial were conducted under the conditions of tillage conditions of 40 cm deep loosening and 15 cm rotary tillage. Under the planting density of 90 000 plants / hm 2 and 105 000 plants / hm 2, Single 958 and Denghai 618, the United States Xiangyu 335 and China and the United States No. 1, the Department of German KX3564 and KWS2564 maize varieties of different aboveground morphology, physiology and yield components of the comparative analysis. The results showed that, Nongsong can reduce the net photosynthetic rate, LAI, SPAD value and per plant productivity decline after densification, alleviate the plant type changes and improve the density of corn. The tight tolerance of maize varieties in China was different from that of the American and German maize cultivars. Comparing with rotary tillage, the densities of Maize No.1, KX3564, KWS2564 and Xian-Yu 335 increased their planting density, The leaf inclination, net photosynthetic rate, LAI and SPAD decreased slowly, and the yield and tolerance index increased markedly. The response of deep tolerance to deep plowing was higher than that of Zhengdan 958 and Denghai 618.