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利用土壤水分张力计监测土壤水分吸力的变化 ,以灌水时 30cm土层的土壤水分吸力表示渗灌灌水下限 ,研究灌水下限为 10、16、2 5、4 0和 6 3kPa时对塑料大棚番茄生长和产量的影响 .结果表明 ,番茄株高、生物量分别随灌水下限的增大而减小 .番茄的产量和水分利用率与灌水下限间的关系曲线为抛物线 ,而茎粗 /株高比与灌水下限间的关系曲线为三次多项式曲线 .灌水下限不同 ,番茄的根 /冠比 (R/S)动态不同 ,番茄根系与株冠的生长状况不同 .灌水下限在 2 5～ 33kPa时 ,番茄植株生长健壮 ,根冠比例协调 ,产量大 ,水分利用率高 .此指标作为渗灌灌水下限 ,灌水时土壤水分的含量比常规灌水低 ,灌水次数少 ,有利于提高保护地番茄栽培的水分利用率和劳动生产率 .
The change of soil water suction was monitored by soil moisture meter. The soil water suction of 30 cm soil layer was used to indicate the lower limit of irrigation water infiltration. The effects of irrigation lower limit of 10, 16, 25, 40 and 6 3 kPa on the growth of tomato in plastic greenhouse And yield of tomato.The results showed that the plant height and biomass of tomato decreased with the increase of the lower limit of irrigation.The curve of yield and water use efficiency and the lower limit of irrigation was parabola while the ratio of stem diameter to plant height The relationship curve between irrigation lower limit is cubic polynomial curve.Water irrigation lower limit, the root / crown ratio (R / S) dynamic of tomato is different, tomato root system and crown growth conditions are different.When the irrigation limit is between 25 and 33kPa, tomato plants Growth and robustness, the proportion of root and crown is coordinated, the yield is large, and the water utilization rate is high. As the lower limit of infiltration irrigation, soil water content in irrigation is lower than conventional irrigation and less irrigation times, which is beneficial to increase water use efficiency of tomato cultivation in protected area And labor productivity.