For the summer crops of winter wheat, the beginning of the summer into the flower filling period. By the flowering stage, although the number of spikes in the wheat field has been set, the number of grains has not been completely determined; as for grain filling or grain weight, it is determined by the growth from flowering to maturity. The management of water and fertilizer at this stage cannot be relaxed, it is critical to the formation of production.
The principle of water and fertilizer management in the later period depends on the situation of wheat. The characteristics of late-stage fertility in wheat are centered on grain formation, including processes such as flowering and pollination, grain filling, etc. This will determine the number of grain weights and grains and play an important role in summer grain yield. The leaves are the photosynthetic products of wheat and organs for transpiration. If the leaves are senescent too late, they will be disadvantageous for grouting; if the leaves are too lush and late mature, it will not be conducive to high yield. The goal of water and fertilizer management at this stage is to maintain the vitality of the root system, extend the functional period of the leaf, prevent premature aging and late maturity of the glutinous green, and promote the photosynthetic product to the grain to strive for grain weight. Therefore, the following management measures should be taken for different wheat conditions:
For wheat fields whose heading color is significantly weakened and whose population is not large, the topdressing nitrogen fertilizer can be applied once, and at the same time, watering the flower-growing water can be performed. The amount of nitrogen fertilizer should be appropriate. This top dressing is mainly based on protection, and it can be supplemented with a small amount of nitrogen. More can lead to late-maturing gluttony and even lodging; as long as it is mastered, it can increase the grain weight and even help the number of grains. Nitrogen fertilizers may be selected from ammonium sulfate, ammonium bicarbonate or urea. The net amount of nitrogen does not exceed 1.5-2 kg per mu.
For large populations of wheat fields, in order to prevent the lodging caused by late dry hot wind, spraying 1%-2% humic acid, 1% urea, and potassium dihydrogen phosphate mixture during the flowering-filling stage is beneficial to Maintain a grain weight and resist lodging caused by dry hot air.
In normal wheat fields with irrigated conditions, depending on soil moisture, timely irrigation of flowering water or grouting water before the peak of flowering-filling is conducive to the development of wheat endosperm, enlargement of seed skin and caryopsis, thus increasing the storage capacity; Locust and so on.
In short, the post-harvest fertility of wheat as a flower-filling stalk is crucial for yield protection. Late water and fertilizer management can not be relaxed, but late water and fertilizer management must be appropriate, otherwise it may cause both greediness and premature aging, both of which will lead to reduced production.
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