The study of wheat seeds and roots with a root analyzer showed that the seedling roots of the drought-resistant wheat cultivars are well-developed, with fast downswing, deep distribution, and large proportion of deep roots. In the Loess Plateau region of northwestern China, there is little precipitation at the later stage of wheat growth, and the shallow soil water is often depleted, but abundant water is still stored in deep layers of the soil where drought resistance is good. In this case, the roots are deeply rooted, the deep roots are abundant, and the ability to absorb the deep water in the soil is strong, and it is even more resistant to drought. Narayan has studied the relationship between root growth and productivity of wheat varieties under different soil moisture conditions. He pointed out that under drought stress conditions, the selection of drought-resistant varieties is better than root density when the depth of roots is lower. Select indicators.
Not only that, according to Blum and Johnson (1992) using PVC pipes to study the root system of wheat, when the surface soil water is depleted, the water absorbed by the deep roots can be released into the surface soil to ensure that the crop absorbs nutrients from the tillage layer. The study of seedling orchards on the relationship between different types of wheat seedlings and soil water use shows that wheat root seedlings have more surface roots and less roots. This kind of root type consumes a large amount of soil surface moisture in the early stage, and has a weak ability to use soil moisture in the middle and later stages, so it has poor drought resistance and low productivity. The root distribution of high yield and strong seedlings is relatively deep, and the relative proportion of deep roots is large, which not only consumes less water in the surface layer of soil, but also makes full use of deep soil moisture and improves the water use efficiency under the conditions of soil drought in the middle and later stages of reproduction. Therefore, it is particularly important to cultivate strong seedlings before winter in drought conditions.
Crop Root Distribution and Resistance Many studies have shown that the vertical distribution of crop roots is closely related to its resistance. Studies on summer soybean roots show that deep-rooted 0 varieties are better able to use deeper soil moisture, and have better adaptability to areas with higher groundwater levels but lower soil layers due to less rainfall, while shallow-rooted varieties are easier to use. Soil surface moisture, suitable for areas with more rainfall or more humid. Yan Zhende et al. pointed out that the total root volume of sweet potato drought-resistant varieties is not only 2 times larger than that of non-drought-resistant varieties, but also that root volume in deep soil layers (30-40 cm) is 5 times that of non-drought resistant varieties. It was also pointed out that the more root volume in a unit volume of soil layer is more beneficial to crop water absorption, especially the deep root system is more important when the soil is seriously drought.
Related equipment: Soil moisture meter Soil moisture recorder
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