地膜覆盖栽培对黄瓜干物质积累和养分吸收分配规律的影响

覆膜能明显提高黄瓜生育前期的干物质积累和对各营养元素的吸收,初花期二者分别比对照增加75％和79.2％(N、P、K、Ca、Mg五种元素平均);养分吸收高峰比对照提前,出现在采收至采收盛期,五种元素吸收强度平均为420克/亩·日,比对照增加40.1％;覆膜能提高土壤的供肥能力,前期尤为突出。在产量表现上,覆膜区黄瓜亩产7151公斤,比对照增产23.2％。

EFFECT OF PLASTIC FILM MULCHING ON DRY MATTER ACCUMULATION AND NUTRIENT UPTAKE AND DISTRIBUTION OF CUCUMBER PLANTS

Experiments suggested that film mulching significantly promoted cucumber plants to accumulate dry matter and uptake various nutrients at early stages of growth and development. The mulched plants at the beginning of flowring accumulated dry matter and uptook nutrients, including N, P, Ka, Ca and Mg, 75.0 and 79.2％ more than unmulched plants, respectively. The nutrient uptake peak of the mulched plants took place earlier than that of the controis, occurring from the beginning to full harvesting, and the amount of the five elements absorbed by the plants averaged 6300g/ha a day, 40.1％ over the control, Film mulching also increased the capacity of applying fertilizer of soil, especiall at early stages of vegetative growth. The cucumber yield of mulched plants was 107265kg/ha in round numbers, 23.2％ higher than that of control.