关键词: 植物甜蛋白, 植物甜蛋白

Abstract: Soil bulk density and porosity influence the bioavailability of soil nutrient and crop growth, and are closely related to the cultivation, fertilization, irrigation and other agricultural management measures. In order to research soil environmental quality and explore the optimal fertilization mode under Greenhouse field conditions, soil bulk density, porosity and soil respiration intensity were studied under the optimized fertilization conditions, with the soil of no chemical fertilizer and manure for control in Shouguang Greenhouse vegetables field planting tomato, and the results showed that, compared with the control, the optimized fertilization treatments improved the soil bulk density and porosity conditions in a certain extent. Such measures reduced the soil bulk density by 3.73% to 14.93% and increased the soil total porosity by 4.18% to 15.79%. In the meantime, the average capillary porosity and the non capillary porosity increased by 8.07% and 8.94%, respectively. Soil respiration intensity enhanced by 23.4% to 34.6% in the root zone and by 9.6% to 106.9% in the non root zone compared with the control. Among them, the treatment with 8 t/hm2 of manure and 4 t/hm2 of straw blending broadcast, and topdressing 150 kg/hm2 of nitrogen in the growth period got the most obvious effect and should be recommended to apply in the production practice. The results also showed that the average soil respiration intensity in root zone was 62.91 mg/kg?d with about 1.8 times of 34.45 mg/kg?d in the non-root zone. Soil respiration intensity was parabolic relationship to soil bulk density and soil total porosity. When the soil bulk density was about 1.25 g/cm3 and total porosity was about 53%, the soil would have higher respiration intensity.