Method for adjusting and controlling florescence irrigation amount based on precipitation amount from winter wheat jointing to flowering stage

Abstract

The invention relates to a method for adjusting and controlling florescence irrigation amount based on the precipitation amount from winter wheat jointing to a flowering stage and belongs to the technical field of crop irrigation. According to the method, irrigation is not performed in a filling period before winter wheat overwintering on the basis of adoption of a water-saving and drought-resistant variety, improvement of soil preparation and sowing quality, sowing with enough moisture, later sowing in a suitable phase, compactness after sowing and cultivation of strong seedlings before winter, the water irrigation amount in a jointing phase is 50-60 m<3>/mu, and the water irrigation amount in the flowing phase is adjusted and controlled based on the precipitation amount from jointing to the flowering stage. When the precipitation amount is not lower than 25 mm, irrigation is not needed, the output reduction extent can be controlled to 10% or below. When the precipitation amount is lower than 25 mm, the precipitation amount is 40-50 m<3>/mu. In addition, irrigation is not needed before overwintering and in the filling period. The method can be widely applied to a winter wheat planting system in the North China region, has the dual effects of yield stabilizing and water saving and has the very important significance on guarantee of grain production in the region and relieving of over exploitation of underground water.

Description

technical field [0001] The invention belongs to the technical field of crop irrigation, and relates to an irrigation method for winter wheat, in particular to a method for regulating and controlling irrigation in the flowering stage based on the precipitation from jointing to flowering stage of winter wheat. Background technique [0002] The North China Plain is an important main grain production base in my country, and it is also one of the most water-scarce areas, with the total water resources accounting for only 7.6% of the country's total. Double cropping of winter wheat and summer corn is the main planting method in the North China Plain. Due to the influence of the monsoon climate, the precipitation is mainly distributed in the summer corn season, while the winter wheat season is dry and less rainy. The average annual rainfall is only about 100mm, which is much lower than the growth period of winter wheat. The water consumption is 350-450mm, so in order to obtain high...

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Problems solved by technology

The flowering period of winter wheat is the key growth period for pollination and fruiting and then for grain filling. Since the jointing period of winter wheat, the precipitation in this area has gradually increased, but the inter-annual variation is large. The variation range of precipitation is 0-57mm. If the precipitation before flowering of winter wheat is relatively low, and the soil moisture content is low during the flowering period, timely irrigation is required, and the effect of increasing yield is remarkable. Blind irrigation will not only increase the yield, but also waste water resources. Therefore, in order to achieve the dual purpose of water saving and high yield of winter wheat, the irrigation decision in the flowering period is particularly important.

[0004] In the past, the determination of whether to irrigate winter wheat during the flowering period was mainly based on seedling conditions and soil moisture. The judgment of seedling condition indicators lacked a unified standard and was often based on experience, and the seedling conditions of different plots were also quite different. However, the measurement of soil moisture content

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