不同间作绿肥替代化肥模式对木薯性状和产量的影响

通过探讨秸秆还田与化肥减施下间作绿肥对木薯产量性状的影响,着力解决连作木薯土壤肥力提高与改良相关技术的协调增效。于2019-2020年,以木薯品种“南美1号”为供试材料,设置8个处理,调查每个小区的木薯茎径、叶绿素（SPAD）、块根直径、块根长、单株茎秆鲜重、单株块根鲜重、株高、单片叶重、单株块根数以及小区产量等农艺性状。结果表明,处理5（木薯秆还田+化肥减量12.5%+12.5%营养元素当量黑豆绿肥还田）的木薯产量最高,并得到拟合方程。绿肥秸秆还田以及间作绿肥从整体上改良了土壤肥力,并通过显著影响木薯块根、单片叶重以及单株块根数而影响最终产量。

Effects of Different Intercropping Modes of Green Manure Replacing Chemical Fertilizer on Cassava (Manihot esculenta Crantz) Traits and Yield

This study aimed to explore the effects of green manure instead of chemical fertilizer on the growth and yield of cassava and to solve the key technical problems such as synergism between continuous cropping cassava soil fertility improvement and related technologies. Field experiments with eight trial treatments were conducted from 2019 to 2020 with the cassava variety "South America No.1" as the test material and investigated the parameters including stem diameter, SPAD, root diameter, root length, stem fresh weight per plant, root fresh weight, plant height, single leaf weight, root number per plant, and plot yield of cassava. The results showed that the cassava yield was the highest under treatment 5 (cassava straw returning+12.5% chemical fertilizer reduction+12.5% nutrient elements equivalent to black bean green manure returned to the field), and the best fitting equation was obtained. In a word, green manure straw returning and intercropping improved soil fertility on the whole and affected the final yield of cassava by significantly affecting root diameter, single leaf weight, and root number per plant.