不同氮水平对马铃薯产量构成和土壤NO_3^--N含量的影响

Effects on Potato Production and Soil NO_3^--N Content of Different Levels of Nitrogen Applicaiton

在滴灌条件下对比研究了不同氮水平下马铃薯(Solanum tuberosum L).的产量构成和土壤NO3--N含量的动态变化。结果表明,随着氮素水平的升高,产量和商品率都先上升后下降,氮水平在180 kg N.hm-2时最高;大部分块茎大小分布都集中在4.5～7 cm范围内,还有一定的增产空间;氮素量对薯块的大小影响很大,而对畸形薯所占比例的大小没有规律性影响;随着施氮量的增加,氮淋失程度加深,土壤中的NO3--N含量逐渐增加,各施氮水平下随着土层的加深又有不同程度的递减。

Potato production and soil NO3--N profile were studied under different nitrogen regimes in drip irrigation condition.Production and marketable tuber percentage first increased and then decreased with the level of nitrogen increase,both being the highest when nitrogen fertilizer was applied at 180 kg·hm-2.Most tubers were 4.5-7 cm in size,still having some room for yield increase.The amount of nitrogen had influence on tuber size,but not on deformed tubers.With the increase of nitrogen,the leaching losses of...