为揭示微孔混凝土灌水器形状及参数对流量的影响,提高微孔混凝土灌水器选用的合理性,该文以砂子、水泥、硅溶胶为原料,采用干压结合雾化加湿法制备开口孔隙率为20.3%~20.5%的微孔混凝土圆片和圆管试样,然后将2种试样组装成灌水器,研究...为揭示微孔混凝土灌水器形状及参数对流量的影响,提高微孔混凝土灌水器选用的合理性,该文以砂子、水泥、硅溶胶为原料,采用干压结合雾化加湿法制备开口孔隙率为20.3%~20.5%的微孔混凝土圆片和圆管试样,然后将2种试样组装成灌水器,研究微孔混凝土灌水器的形状及参数对流量的影响。结果表明:片状灌水器的流量随圆片直径增加而增大,随圆片厚度增加而减小,片状灌水器的单位面积流量只取决于圆片厚度,与圆片直径无关,当水头为3 m时,随着圆片厚度由5 mm增至20 mm,片状灌水器的单位面积流量由40.5 m L/(h·cm^2)降至25.7 m L/(h·cm^2);管状灌水器流量随圆管长度和直径增加逐渐增大,管状灌水器的单位面积流量随圆管厚度增加而减小,随圆管直径增加逐渐增大。该研究为微孔混凝土灌水器的科学应用提供了理论依据。展开更多
The purpose of this article is to study the effects of different water elevations of non-pressure subirrigation on some indexes of tomato, including soil water status around crop rootzone, morphological indexes, physi...The purpose of this article is to study the effects of different water elevations of non-pressure subirrigation on some indexes of tomato, including soil water status around crop rootzone, morphological indexes, physiological indexes, photosynthetic indexes, yield, quality, and water use efficiency. With the tomato materials of Dongsheng 1, the irrigation experiment was carried out in the greenhouse, and significance analysis was done on the experiment data through the software of DPS. The results showed that different water elevations, had significant influence on the growth, yield, and quality of tomato. The yield of the 6-cm treatment was the highest, the 3-cm treatment was inferior to the 6-cm treatment, and the 0-cm treatment was the lowest. However, the WUE was 0 cm 〉 3 cm 〉 6 cm. The sugar/acid and soluble protein was the highest under the 0-cm treatment, and the content of ascorbic acid did not decrease considerably. When compared to the 0-cm treatment, the ascorbic acid content of 6-cm and 3-cm treatment increased by 19.2 and 6.8%, respectively. These irrigation methods can satisfy the requirements of tomato growth; different water elevations have different influences on the tomato soil water status around crop rootzone, the physiological characteristics, and yield. It also harmonized the percentage between sugar and acid, increased the content of soluble protein and ascorbic acid, and made tomato more delicious. The irrigation methods can improve the quality of tomato by water control, which is worth promoting in the agricultural production.展开更多
文摘为揭示微孔混凝土灌水器形状及参数对流量的影响,提高微孔混凝土灌水器选用的合理性,该文以砂子、水泥、硅溶胶为原料,采用干压结合雾化加湿法制备开口孔隙率为20.3%~20.5%的微孔混凝土圆片和圆管试样,然后将2种试样组装成灌水器,研究微孔混凝土灌水器的形状及参数对流量的影响。结果表明:片状灌水器的流量随圆片直径增加而增大,随圆片厚度增加而减小,片状灌水器的单位面积流量只取决于圆片厚度,与圆片直径无关,当水头为3 m时,随着圆片厚度由5 mm增至20 mm,片状灌水器的单位面积流量由40.5 m L/(h·cm^2)降至25.7 m L/(h·cm^2);管状灌水器流量随圆管长度和直径增加逐渐增大,管状灌水器的单位面积流量随圆管厚度增加而减小,随圆管直径增加逐渐增大。该研究为微孔混凝土灌水器的科学应用提供了理论依据。
基金This research was supported by the National Natural Science Foundation of China （50479051）the Agricultural Science and Technology Achievement Transformation Foundation of China （04EFN217100395）the Innovation Projects of Northwest A ＆ F University for Graduate Students.
文摘The purpose of this article is to study the effects of different water elevations of non-pressure subirrigation on some indexes of tomato, including soil water status around crop rootzone, morphological indexes, physiological indexes, photosynthetic indexes, yield, quality, and water use efficiency. With the tomato materials of Dongsheng 1, the irrigation experiment was carried out in the greenhouse, and significance analysis was done on the experiment data through the software of DPS. The results showed that different water elevations, had significant influence on the growth, yield, and quality of tomato. The yield of the 6-cm treatment was the highest, the 3-cm treatment was inferior to the 6-cm treatment, and the 0-cm treatment was the lowest. However, the WUE was 0 cm 〉 3 cm 〉 6 cm. The sugar/acid and soluble protein was the highest under the 0-cm treatment, and the content of ascorbic acid did not decrease considerably. When compared to the 0-cm treatment, the ascorbic acid content of 6-cm and 3-cm treatment increased by 19.2 and 6.8%, respectively. These irrigation methods can satisfy the requirements of tomato growth; different water elevations have different influences on the tomato soil water status around crop rootzone, the physiological characteristics, and yield. It also harmonized the percentage between sugar and acid, increased the content of soluble protein and ascorbic acid, and made tomato more delicious. The irrigation methods can improve the quality of tomato by water control, which is worth promoting in the agricultural production.
