Effect of Light Intensity and Soil Moisture on Fruit Quality and Yield of Pepper

Abstract：According to the experiment, effects of light intensity and soil moisture on fruit quality, yield and water use efficiency during pepper fruit phase were investigated, to elect the optimum pepper shade and soil moisture combinations and achieve water-saving, high yield, high-quality. There are three levels of shade： natural light （L1）, shade 30% （L2） and shade 70% （La）, four soil moisture levels： soil relative water content were 40% to 55% （W1）, 55% to 70% （W2）, 70% to 85% （W3）, 85% to 100% （W4）. The results showed that： ①pepper leaf and stem dry mass increased, while root dry mass decreased, pepper fruit length, fruit diameter and fruit weight increased, with the increasing of soil water content, in natural light and shade 30 %, but pepper fruit growth showed a downward trend in soil moisture content exceeding field maximum moisture holding capacity of 70 % to 85 % ; ②Moderate shade and reduce soil moisture con- tent are benefit for increasing fruit quality, which vitamin c, soluble sugar, free amino acids and soluble protein content in L2W2 are higher than in other treatments③With the increasing of soil moisture content, water consumption increased, the output was increased and then falling in the same light conditions, and the appropriate reduction in soil moisture is conducive to the improvement of water use efficiency. The same soil moisture and moderate shade are conducive to enhance productivity and reduce invalid water consumption. 30% shade and soil relative water content of 55% to 70%, can be the optimal shade and soil moisture combination during the fruit period of pepper.