掺气滴灌对温室辣椒生物量及产量的影响

Effect of Aerated Subsurface Drip Irrigation on the Biomass and Yield of Greenhouse Pepper

研究不同掺气比例、不同类型土壤条件下掺气滴灌对改善作物生长、提高地下滴灌效率有重要意义.以河南省不同类型土壤及温室辣椒为供试材料,以不曝气为对照,设置2个内循环曝气条件(0.1 MPa和0.2 MPa,掺气浓度分别为7%和13%),通过桶栽试验研究滴灌条件下掺气滴灌对温室作物生长的影响.结果表明,掺气滴灌在黏壤土和粉质黏壤土中效果明显,而在砂壤土中效果不明显.在黏质型土壤中,0.1 MPa掺气滴灌对作物生长有较好的促进作用.

Oxygen supply for soil can effectively improve the rhizosphere environment in anoxic soil and enhance the vitality of crop root system under the condition of irrigation. The research on the effect of the aerated subsurface drip irrigation on the crop growth in differ- ent aeration rates and different soil types is of great significance. With different soil types in Henan province and greenhouse pepper as study material, the effects of subsurface aerated irrigation on crop biomass and yield were conducted through pot experiment. Results showed that aerated subsurface drip irrigation exerted positive effect on pepper growth in clay loam and silty clay loam, especially in the clay loam, but negative effect in sandy loam soil. Under clay loam and silty clay loam, the biomass and yield of peppers at 0.1 MPa with 7% aeration concentration is superior to others. Therefore, for the adoption of aerated subsurface drip irrigation in clayey soil, 0.1 MPa of aeration is suggested for the improvement of green pepper growth.