Spring crops produce high yields

Spring crops such as corn, soybeans, rice, sweet potatoes, peanuts, and cotton soon arrived at the time of sowing and planting. From the perspective of field management, the foundation and the first condition for these high-yield spring crops is to obtain good seedlings. As the saying goes, “There is money to buy seeds and no money to buy seedlings.” Only the individual seedlings and sufficient groups of field seedlings can achieve high yields. To this end, the modern cultivation science and technology essentials for creating high yields are “seven-point three-in-three”. It can be seen that the importance of “seed” for high crop yields. One of the important farming activities for sowing spring crops is applying fertilizer.

The seedling nutritional characteristics of spring crops

The nutrient requirement of the spring crops at the seedling stage is not large, but the nutrient concentration in the seedling stage is high, and it is required that the soil has a strong fertilizer supply capability. Not only nitrogen, phosphorus, and potassium are needed, but also intermediate and trace elements, especially boron, zinc, calcium, sulfur, and the like. However, the root system of the crop during seedling development is weak, and the ability to absorb fertilizer and water is poor. In northern regions, especially in the northeast region, the spring temperature is low. When sowing corn or soybeans, the soil temperature is low, and the nutrients released from the soil itself are slow and may not be supplied. The demand for nutrients for spring crops such as corn and soybeans is small, but it is sensitive and strict, so it is necessary to supply less nutritious nutrition.

Seedling period is the critical period of phosphorus nutrition, and the requirement for phosphorus fertilizer is particularly high. If the supply of phosphorus is insufficient, it will be prone to phosphorus deficiency symptoms and affect the subsequent production. For example, purple leaf symptoms appear at the 3-leaf stage of corn. If the application of phosphate fertilizer after the seedling period, it is difficult to make up for the loss caused by the lack of. In addition to phosphorus, seedlings are also sensitive to trace elements such as boron, zinc, sulfur, and calcium. To ensure the timely supply of these nutrients, it is possible to improve the ability of seedlings to resist drought and resist cold and to achieve the purpose of cultivating strong seedlings. Therefore, in the case of crops such as corn and soybeans, which are not very fertile or do not use organic fertilizer all year round, in addition to deep basal fertilizers, we must combine planting and fine seeding with fertilizers, which is already a strong seedling for cultivation and increased yields. This item is a mature and effective technology.

Fertilizer application technology

Fertilizer is a method of fertilizing a small amount of fertilizer near the seed when sowing. The role of seed fertilizer is to ensure that the seedlings of spring crops are strong, and the amount of seed fertilizers cannot be increased. The ratio of nutrients is mainly phosphorus, with a small amount of nitrogen. The commonly used seed fertilizer is diammonium phosphate. Although the amount of fertilizer is not much, but it can play the role of four or two.

The key to the application of fertilizer is to control the appropriate amount, but also pay attention to the fertilization position, a small amount of fertilizer should be applied in the seed obliquely 3 to 5 cm below, avoid the chemical fertilizer close to the seed, otherwise even if the number is appropriate, there may be burning problems . Under mechanical sowing conditions, seed and fertilizer are sown separately from the two reserve tanks and the two seed tubes, so that the fertilizer and the seed do not lie on the same plane to ensure safe emergence.

Not all nitrogen fertilizers are suitable for seed fertilizers. They must both strictly control the amount of nitrogen applied to the seed fertilizer and select nitrogen fertilizers. Single nitrogen fertilizer and ammonium sulfate are suitable for seed fertilizer, and ammonium bicarbonate, ammonium chloride, ammonium nitrate and urea are not suitable. In recent years, the lessons learned from the improper use of seed fertilizers in various regions have caused the burning of seedlings and rotten seedlings worth learning. For example, high-tower high-nitrogen compound fertilizers are used as seed fertilizers, and where there is a large amount (greater than 10 kg/mu) and the soil is not deep enough, there are various problems in inhibiting seedling growth. Phosphate diammonium fertilizer as a seed fertilizer is better, the emergence of security, seedling growth and robust.

Fertilizer application route

A large number of elements of fertilizers are mainly applied to soil, and trace elements can be soaked or seeded. For example, in the prevention and correction of rice seedlings due to phosphorus deficiency, the southern part of the country generally applies superphosphate or calcium magnesium phosphate fertilizer. The prevention and correction of rice seedlings sometimes caused by zinc deficiency is the use of 0.1% zinc sulfate solution seed dressing or soaking; otherwise, the soybean is sensitive to the lack of molybdenum, lack of molybdenum nodules, low activity, can not cause nitrogen fixation Miao is not strong. The practice of fertilizing molybdenum is as follows: 2 grams of ammonium molybdate per kilogram of seed, first dissolved with a small amount of water, and the solution of 2% to 3% of water, sprayed on the seed with a sprayer, and sprayed while stirring, the solution Should not be too much, so as to avoid wrinkling seed coat, causing bad species. After the seeds are mixed, they can be sown by drying them.

In a word, the principle of applying seed fertilizer in spring sowing crops is to combine a large number of elemental fertilizers with trace element fertilizers so as to achieve accurate application and accurate location.

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