蔬菜无土栽培营养液中的氮素及其调控

The solution nitrogen of vegetable in nutrient solution and its regulation

综述了蔬菜无土栽培营养液配方中氮素形态、浓度对蔬菜生长发育的影响,以及环境条件对不同形态氮素吸收的影响.经分析认为:蔬菜对氮素形态的吸收因作物种类、基质、pH值等条件而异.多数人认为:不使用或部分使用NH+4-N有利于蔬菜生长发育,其适宜配比因蔬菜种类、气候等条件而异.在低温弱光下,部分使用NH+4-N有利于蔬菜生长发育;在高温强光下,使用NH+4-N不利于蔬菜生长发育.蔬菜作物营养液的氮素浓度大部分在100～250mg/L,在其适宜范围内,增加氮素浓度有利于作物高产.

This paper is a brief review of the nitrogen in nutrient solution,including the effects of nitrogen forms and concentration on the growth and development of vegetables,the effects of ambient conditions on the uptake different kinds of nitrogen forms. The uptake of different nitrogen forms varies with the species,media,pH etc. Most people state that low NO-3N∶NH+4N wass benefical to the growth and development,but the optimum ratio depend on the vegetable species,climinate etc. Under the conditions of low temperature and low light intensity, NH+4N supply is advantageous to the grow and development of vegetables,while under the conditions of high temperature and high light intensity, NH+4N supply is not so. Nitrogen concentration of vegetables is about 100~250 mg/L.During the optimum range,the yield of vegetable is high as nitrogen concentration increases.