Effect Of Irrigation Quota And Irrigation Frequency Under Mulched Drip Irrigation On Pepper Growth And Physiology

In Gansu arid climate conditions, Pigment red pepper to the United States as experimental materials studied the effect of irrigation quota (170,195,220,245,270,295 m3/mu)and irrigation frequency(once a week and once two weeks)under mulched Drip on pepper growth, chlorophyll fluorescence and other physiological indexes. The main results showed as follow:1.220m3/mu treatment plant height, stem diameter, shoot dry weight, yield per mu, yield per plant were better than other treatments; The Fv/Fm, Fv/Fo,ΦPSⅡ, qP value of Chlorophyll a fluorescence parameters in pepper leaves diurnal variation were higher than other treatments, showed higher photosynthetic capacity. In Gansu arid climate conditions, 220 m3/mu is appropriate for the production of pigment Pepper.2. Under 220m3/mu irrigation quota, once a week irrigation had higher plant height, stem diameter, yield per mu, yield per plant,ΦPSⅡand qP than once two weeks. In whole growth period once a week's MDA content was significantly lower than two weeks time's,and before the flowering period and fruit harvested, once a week irrigation's Pro were significantly less than two weeks time's. Under drip irrigation, once a week was suitable irrigation frequency in the region for pigment production.3. Under once a week irrigation, MDA content of 245,270,295 m3/mu irrigation quota was higher than 220 m3/mu of, indicating plants exposed to high water stress.170,195 m3/ mu of proline, soluble sugar was higher than 220 m3/mu, and before the harvest SOD and the results flourishing Period POD activity was significantly lower than 220 m3/mu, showing the physiological effects of drought stress.4. Under once two weeks irrigation,170,195 m3/mu treated MDA, proline, soluble sugar and soluble protein content were whole higher than 220 m3/mu treatment, while the SOD activity in the period of flowering fruit and the POD activity of pre-harvest senescence were lower, demonstrated the physiological effects of drought stress.5. within 10-30cm, the soil water content of once a week irrigation was always greater than once two weeks irrigation, while 50cm department of soil moisture content was contrast, showed that high-frequency irrigation could reduce the deep soil water leakage, was more suitable for Pigment pepper production.