Is it all right to apply fertilizer to wheat once a year?

Base fertilizer: 3 tons of organic fertilizer per mu, plus calcium superphosphate 40kg, urea 10 kg, potassium chloride 7.5-10kg. Seed fertilizer and seedling fertilizer: seed fertilizer is urea 2.5kg, seedling fertilizer is urea 5kg. Jointing and booting fertilizer: wheat fields with faded and yellowed leaves could apply urea 3-5kg per mu, fixed length of the first Internode and 3kg urea per mu when the second Internode elongated rapidly.

1. Base fertilizer

General base fertilizer accounts for 60% of the total fertilizer, about 3 tons of organic fertilizer per mu, plus calcium superphosphate 40kg, urea 10 kg, potassium chloride 7.5-10kg, or organic fertilizer combined with 45% compound fertilizer 20kg can be applied to the soil as base fertilizer.

2. Seed fertilizer and seedling fertilizer

The main results are as follows: 1. Generally, when sowing wheat, appropriate amount of chemical fertilizer can be used as seed fertilizer, which is beneficial to promote wheat rooting and early tillering, especially for late stubble wheat or wheat with insufficient base fertilizer, the effect is very obvious. Urea per mu of seed fertilizer is lower than 2.5kg. In addition to seed fertilizer, early application of seedling fertilizer, that is, tillering fertilizer, is a good measure to promote root and increase tiller, and to increase effective tiller.

2. It is suggested that the seedling fertilizer should be applied at the 3-leaf stage, urea 5kg per mu should be used, the base fertilizer should be sufficient, the large population should be applied less, and the bottom seedling should be applied more. Generally in the northern wheat area, the wheat enters the green stage after winter. In order to consolidate the tillering before winter and promote the tillering after the year, the returning green fertilizer should be applied once earlier.

3. Returning to green fertilizer needs to be mainly quick-acting fertilizer, generally using calcium superphosphate 10kg and ammonium sulfate 10-15kg per mu. If the early fertilizer is sufficient and the growth of wheat seedlings is exuberant, it can not be applied, especially in the south, the number of fertilization needs to be determined according to the seedling condition.

Third, jointing and booting fertilizer

The main results are as follows: 1. The jointing and booting stage of wheat is a relatively exuberant period in the whole growth process, and there is a large demand for nutrients at this time. If the wheat is de-fertilized, it will cause premature senescence of wheat, but too much fertilization will also lead to excessive plant growth, which is not conducive to the differentiation and development of young spikes. therefore, jointing and booting fertilizer needs to be skillfully applied by seedlings.

2. For weak seedlings, that is, the wheat fields with small population and less than 300000 total tillers per mu and leaves fading and yellowing, early application of jointing fertilizer is needed, which is beneficial to improve tillering and panicle formation, strive for multiple spikes and large ears, urea 3-5kg per mu can be applied and watered.

3. For robust wheat seedlings, because the population is suitable and the number of panicles is guaranteed, it is necessary to focus on large ears, and fertilizer and water can be properly controlled at jointing stage to promote the sturdiness of basal internodes and avoid lodging. When the leaf color fades naturally, the first Internode is fixed and the second Internode grows rapidly, 3kg urea is applied per mu, while for the prosperous seedlings with large leaf area and thick green leaves, fertilizer and water need to be controlled, roots are injured and tillers are restrained in deep tillage. There is no need for topdressing.