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首页> 外文期刊>International Journal of Agricultural and Biological Engineering >Effects of irrigation regimes on soil NO3--N, electrical conductivity and crop yield in plastic greenhouse
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Effects of irrigation regimes on soil NO3--N, electrical conductivity and crop yield in plastic greenhouse

机译：灌溉制度对塑料大棚土壤NO3--N，电导率和农作物产量的影响

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Developing water-saving irrigation regimes has important practical significance not only in alleviating the crucial water shortage, but also in controlling soil salinization for the protected cultivation in eastern China. A field study with six treatments was conducted to evaluate the effects of different irrigation regimes with subdrainage systems on the soil nitrate nitrogen, salinity and moisture, also evaluate the effects on tomato growth, fruit yield and irrigation water use efficiency (IWUE). The treatments were distinguished by three different irrigation amounts of 310 mm, 360 mm and 410 mm, and two irrigation frequencies of 7 and 11 times. Results showed that the irrigation amount had significant effects on the soil NO3--N and electric conductivity (EC). A positive correlation was detected between soil NO3--N (x) and EC (y) at 0-20 m depth after harvest, with a linear equation of y = 0.063x – 0.670. Soil volumetric moisture at 0.10 m and 0.20 m depth was increased as the irrigation amount increased. Moreover, a higher amount of irrigation increased the fruit yield but reduced the IWUE of tomato. It was also found that smaller irrigation amounts combined with frequent intervals could increase fruit yield and IWUE. However, the fruit quality of tomato had a significant (p0.05) negative correlation with irrigation amount. Therefore, the parameters of irrigation regime including the irrigation amount and intervals should be considered comprehensively in order to find a compromise between salinity control and irrigation water use efficiency improvement.
机译：发展节水灌溉制度，不仅在缓解关键的缺水问题上，而且在控制土壤盐渍化，为中国东部的保护性耕作中都具有重要的现实意义。进行了六种处理的田间研究，以评估不同灌溉制度与亚排水系统对土壤硝态氮，盐分和水分的影响，还评估对番茄生长，水果产量和灌溉用水效率（IWUE）的影响。三种不同的灌溉量分别为310毫米，360毫米和410毫米，两次灌溉频率分别为7和11倍。结果表明，灌溉量对土壤NO3--N和电导率（EC）有显着影响。收获后0-20 m深度的土壤NO3--N（x）与EC（y）之间呈正相关，线性方程为y = 0.063x – 0.670。随着灌溉量的增加，0.10 m和0.20 m深度处的土壤体积水分增加。此外，较高的灌溉量增加了水果产量，但降低了番茄的IWUE。还发现较小的灌溉量加上频繁的间隔可以增加果实产量和IWUE。然而，番茄的果实品质与灌溉量之间存在显着的负相关（p <0.05）。因此，应综合考虑灌溉制度的参数，包括灌溉量和灌溉间隔，以便在盐度控制和提高灌溉用水效率之间找到折中方案。

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