Effects of different water treatments on growth, yield and quality of greenhouse eggplant
(1.College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 2.Beijing Hydraulic Research Institute, Beijing 100044, China; 3.Beijing Engineering Technique Research Center for Exploration and Utilization of NonConventional Water Resources and Water Use Efficiency, Beijing 100044, China)
In order to improve watersaving irrigation and eggplant yield in greenhouse, through experiments under drip irrigation in the greenhouse, the effect of different field water capacities (respective irrigation minima of 90% of FC, 80% of FC, 70% of FC, 60% of FC, hereinafter referred as T1, T2, T3 and T4) on the crop growth, root development, fruit yield and quality were studied. The results show that, as soil water content threshold declined, plant height, stem diameter, leaf area and aboveground biomass first increased and then decreased. T2 is better than the other three treatments. Eggplant roots are mainly distributed in soil depth between 0-40 cm, which is rapidly reduced as soil depth increases. Total root length density and total root surface area density decreased as irrigation minima decreased. The highest yield was obtained under T2, which is 1.03 of T1, 1.13 of T3 and 114 of T4 respectively. There is no significant difference between the four different treatments. The crude fiber content and nitrate content in the fruit are reduced when soil moisture content is too high or too low. Higher soil moisture is conducive to the amount of amino acids in the fruit, whereas reducing VC content decreased as irrigation minima decreased. To sum, T2 is the best irrigation minimum treatment for the growth of eggplant. Under T2, the growth, yield and quality of eggplant is better.
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