Cotton is one of the major economic crops in China. The main function of the root system is to support the rhododendrons on the ground and absorb water and nutrients. Therefore, the root system has a very important influence on the growth and development of cotton and the level of yield. For this purpose, root analysis systems are required to perform the analysis. Different irrigation methods can affect the growth and development of cotton roots and their spatial and temporal distribution in the soil, and thus affect the absorption of water and nutrients by cotton.

Dry sowing wet out of the cotton root volume is less but the root volume is larger, the root and crown is relatively small, the root system is shallow and the growth and development are advanced. During the flowering and bolling period, the amount of bells in the root system was high, and the growth period was advanced, showing a greater yield advantage. Although the amount of root distribution in the shallow layer of drip-irrigated cotton was relatively large, there was no obvious wet sowing. The distribution of roots in cotton film covered by plastic film was significantly higher than that between films. The narrow row root volume of dry sowing cotton was higher, while the narrow root row distribution of conventional irrigation and drip irrigation was lower than the sum of membrane and root volume. With the increase of the salinity of irrigation water, the root dry weight and root radius increased to some extent, and the root length and root surface area increased significantly. Under the subsurface drip irrigation method, the root dry weight, the root mean radius, and the total root surface area were larger than the surface drip irrigation. Different irrigation degrees of brackish water significantly affected the vertical distribution of the root system in the soil.

Root analysis system studies showed that there was no significant difference in soil distribution between roots of conventional drenched cotton plants and drip-irrigated cotton roots, which were distributed at 10 to 35. In the range of m, the conventional ditch-irrigated cotton plants had less roots, fine and yellow, and the roots of drip-irrigated cotton plants were numerous, fine and white. Therefore, the conventional root coefficient of irrigation is smaller than that of drip irrigation under the membrane, while the total weight of the root system, the weight of the main root, and the weight of the lateral root are all larger than the conventional irrigation. The planar geometrical configuration of the conventional furrow irrigation cotton root system in the soil is "vertical section umbrella type" or "fan type". The roots of cotton drip irrigation under the membrane showed a very asymmetrical configuration. As a method of cotton drip irrigation, plough layer subsurface drip irrigation forms a unique double root system in root distribution. The first layer root system is more and more thin, mainly distributed in 10~20. m; The second layer of roots is strong, white and tender, and is basically covered with 25~42cm soil layer. Because of this double-layered root structure, plough-layer drip irrigation has good resistance to sudden high-temperature weather, and it has the advantage of low rate of physiological flower bell drop in the middle and later stages of cotton.

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