Water-saving irrigation method based on winter wheat seedling condition and soil moisture content

Abstract

The invention relates to a water-saving irrigation method based on the winter wheat seedling condition and the soil moisture content, and belongs to the technical field of agricultural irrigation. The irrigation method includes the steps that the relative water content of soil at the depth of 0 cm to 20 cm, 0 cm to 40 cm, 0 cm to 60 cm, 0 cm to 60 cm, 0 cm to 80 cm and 0 cm to 80 cm is detected in the winter wheat sowing emergence period, the wintering period, the seedling establishment period, the elongation stage, the pollen rising period and the filling period respectively, the detected values serve as soil water moisture content indexes, winter wheat seedlings are classified into vigorous seedlings, first-class seedlings, second-class seedlings and third-class seedlings in the seedling establishment period and the elongation stage according to winter wheat seedling condition indexes including the number of stems, single-plant tillers, large tillers with three leaves or more and the number of secondary roots, irrigation judgment is carried out according to the soil moisture content indexes in different growth periods of winter wheat, and irrigation judgment is carried out according to the soil moisture content index and the seedling condition index in the seedling establishment period and the elongation stage. By means of the irrigation method, the maximum moisture needing amount of crops can be kept according to the soil moisture condition, it is accordingly guaranteed that growth of winter wheat is not limited by moisture, and waste and low efficiency which are caused by timing and quantitative irrigation are avoided.

Description

technical field [0001] The invention belongs to the technical field of agricultural irrigation, and in particular relates to a water-saving irrigation method based on winter wheat seedling condition and soil moisture condition. Background technique [0002] As the main food crop in my country, wheat has a wide planting area, mainly concentrated in the northern plains. The annual precipitation in these areas is 500-700mm and mainly concentrated in summer. The precipitation in the growing season of winter wheat can only meet 30% of its demand -40%, irrigation water becomes the main source of water required by winter wheat. In recent years, with the shortage of water resources, water resource pollution and excessive exploitation of groundwater, irrigation water has gradually become an urgent problem to be solved in agricultural planting. How to rationally irrigate, improve water use efficiency and yield, and ensure food and ecological security has become an urgent technology to ...

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Problems solved by technology

[0003] Existing irrigation technologies mostly use fixed irrigation time and water volume, but the natural precipitation and soil moisture do not match, and it is difficult to achieve the unity of water saving and high yield. The relative water content is irrigated for the water replenishment target (relative water content is the percentage of soil water content in the field water capacity), but this method ignores the important influence of seedling conditions on wheat water consumption and yield formation, and different years and different regions Soil moisture varies greatly between blocks, making it difficult to form a reasonable irrigation standard

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