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采用盆栽方法以新大豆8号为试验材料,研究了4种土壤水分处理(下限分别为田间持水量的80%、70%、60%、50%)对春大豆根系生长、根系活力和单株产量的影响。结果表明:随着水分亏缺加重,根干重、根系吸收表面积、根伤流、根活力均呈现显著降低的变化趋势,表现为80%>70%>60%>50%;7月20日前后亏缺灌溉降低大豆根系的N、P2O5和K2O百分含量和积累量,降低大豆籽粒产量,70%、60%、50%水分处理的单株产量分别为80%处理的87.8%、63.0%、49.9%;水分利用效率以70%处理最高,为0.5 kg.m-3。结果表明通过适度的亏缺灌溉,控制大豆根系的生长和活力变化以及根系对N、P2O5、K2O的积累量未实现大豆节水高产是可行的。
Pot experiment was conducted to study the effects of four soil moisture treatments (lower limit of 80%, 70%, 60%, 50%, respectively) on the growth and root vigor of spring soybean and the single plant The impact of production. The results showed that with the increase of water deficit, root dry weight, root absorption surface area, root traumatic flow and root activity showed a decreasing trend, which showed that 80%> 70%> 60%> 50%; on July 20 Before and after deficit irrigation, the percentage and accumulation of N, P2O5 and K2O in soybean roots were decreased, and the yield of soybean was reduced. The yield of 70%, 60% and 50% water treatments were 87.8%, 63.0% , 49.9% respectively; the highest water use efficiency was 70%, which was 0.5 kg.m-3. The results showed that it was feasible to control the growth and vigor of soybean roots and the accumulation of N, P2O5 and K2O in the roots without high yield of water-saving soybean by moderate deficit irrigation.