【摘要】 高产综合技术采用了垅作、深松、分层深施肥、垅上双条精量播种等综合性措施,全面改善了土壤水、肥、气、热等条件,促使大豆根系向纵深发展。与对照田相比,下层根量增加一倍左右,根茎长度比值提高34％,根系分枝增多,出现了罕见的5—6级根,根系生理活性提高,根系总吸收面积达18.87平方米/株,比对照提高8.43平方米/株,活跃吸收面积提高57.5％,总根量增大83.6％。据相关分析,亩产400斤以内时,10厘米土层表层根量与产量呈显著的正相关,r=0.783。当亩产达400斤以上产量水平时,表层根量与产量不呈直线相关,这表明要获得亩产400斤以上产量应提高10厘米以下根量来夺取更高的产量。更多还原

【Abstract】 A high-yield comprehensive agrotechiques integrating with ridge-culture, deep-tillage, stratified fertilizer application etc. has been used on 4500 mu in State Farms. Improve soil condition for soybean root extending. Such practice can comparing with control, the roots in low layer of soil on high-yield field increased twofold, with more branches and gave rise 5-6 order roots, absorption power stronger, active absorption area increased by 57.5%, total amount of roots increased by 83.6%, and roots-top (T-P) increased by 34%. Weight of roots of 10 cm top soil layer was correlated with yield of soybean. Under 400 jin/ mu condition, correlation coefficient r=0.783, while over 400 jin/mu, the correlation becomes not linear. The results indieate that improving the root development below 10 cm layer is impotent for high yield of soybean.更多还原