Comparative analysis of soil chemical properties under cotton continuously-cropping and cotton-Jiashi melon rotated-cropping modes
[Background]Jiashi county in Xinjiang is a typical cotton-growing area and is also famous for its fruit product of Jiashi melon.This paper aims to explore the rotated-cropping mode of these two agricultural products to investigate how it affects soil chemical properties and compare it to the cotton continuously-cropping mode,and also to provides theoretical support for optimizing agricultural production and planting mode.[Methods]Soil chemical properties index under cotton continuously-cropping(abbreviated as continuously-cropping)and cotton-Jiashi melon rotated-cropping(abbreviated as rotated-cropping)were compared and analyzed based on field soil sampling.The soil samples were collected from two kinds of cropping soil in the surface(0-20 cm),middle(20-40 cm),and bottom(40-60 cm)layers.Soil chemical indices were measured through indoor index analysis,and the distribution characteristics of soil organic matter,total salinity,pH,and salt base ions between the two cropping modes were compared based on t-test and homogeneity test.The variation trend of soil chemical properties and nutrients was explored.[Results]1)The soil organic matter content distribution characteristics under the two cropping modes differed in the study area.The average organic matter content in the different layers of the rotated-cropping soil showed as middle＞surface＞bottom layer.In the continuously-cropping soil,the average organic matter content showed as surface＞middle＞bottom layer.2)The organic matter contents in both modes showed a decreasing trend with the increase of cropping years.Among them,there was a low organic matter content in the continuously-cropping soil,and the variation was small.There was a high organic matter content in the rotated-cropping soil,but the variation was considerable.3)With the increase of planting years,the total salt content in the soil surface and middle layers of the rotated-cropping showed a decreasing trend,while the continuously-cropping soil showed an increasing trend.[Conclusions]The results indicate that the organic matter content in the soil surface and middle layer increases in the rotated-cropping mode,and the content shows a decreasing trend with the increase of years.There is little difference in soil salt ion content between the two cropping modes,but the total salt content of the rotated-cropping soil was higher than that of the continuously-cropping soil.The results provide a scientific reference for optimizing the soil organic matter and the content of each salt base ion through the Jiashi melon and cotton rotated-cropping pattern.
cottonJiashi melonsoil chemical propertiesrotated cropping
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