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在“玉/豆”模式下,研究了不同施氮水平和套作条件下大豆的茎秆特征。结果表明:套作大豆主茎高度显著高于净作大豆,而茎粗和主茎节数差异不显著。净、套作大豆各节间长度呈“降-升-降”的趋势,套作大豆最长节间出现在第9节,比净作大豆最长节间节位点低了2节。与净作大豆相比,套作大豆第7节间长度增加最大,为2.2 cm(F=240.56**,P=0.0001),增加幅度达到61.24%。不同施氮水平下,各节间长度均呈“降-升-降”的趋势,且最长节间位置没有改变。说明套作大豆比净作大豆更容易倒伏的原因是节间长度大幅度的增长和最长节间下移;施氮是影响大豆节间长度的一个因素,但套作条件是使大豆最长节间位置改变的主要原因;防控套作大豆旺长以及茎部倒伏的最佳时期在7节期以前。
Under the “Jade / Bean” mode, the stem characteristics of soybean under different N application rates and intercropping conditions were studied. The results showed that the height of main stem of soybean was significantly higher than that of net soybean, but the difference of stem diameter and main stem was not significant. Net, intercropping soybean inter-plant length was “drop-rise-drop ” trend, intercropped soybean longest internodes appear in section 9, than the net soya longest internode node site 2 . The net length of interplanted soybean segment 7 was the largest (2.2 cm, F = 240.56 **, P = 0.0001), with an increase of 61.24%. Under different nitrogen levels, the length of each internode showed the tendency of “decreasing-rising-decreasing”, and the position of the longest internode did not change. The results showed that the reason why intercropped soybean was easier to lodging than that of net-cultivated soybean was that the internode length increased significantly and the longest internode shifted downwards. Nitrogen application was a factor affecting the internode length of soybean, The main reason for the change of position between internodes was that the optimal period for preventing and controlling the plantation of soybean and the lodging of stems was just before 7 seasons.