How to choose compound fertilizer for winter wheat

Q: What are the characteristics of winter wheat base fertilizer? How to choose compound fertilizer?
Expert: Winter wheat base fertilizer is characterized by high phosphorus and low potassium, and advocates the application of organic fertilizer. Therefore, general-purpose compound fertilizer should be used for general fertility soil, and low-nitrogen and high-phosphorus compound fertilizer should be used for higher fertility soil. According to this principle, urea (or ammonium bicarbonate), diammonium (or superphosphate) and potassium fertilizer can be applied, and the ratio of bottom and nitrogen is about half. Do not carry out one-time fertilization unless the drought is unable to topdress, the so-called "one shelling."
Q: How to prevent and damage heavy watermelons in greenhouses?
Experts: The fundamental way to overcome the dangers of heavy mites is to turn the crops down and not to cast the same kind of crops. In addition, it is also effective to increase the application of decomposed organic fertilizer, balance the application of chemical fertilizers, wash the salt in the summer, and wash the salt with rainwater to maintain the appropriate temperature and humidity in the shed. It has also been reported that reasonable grafting, such as grafting with watermelon and melon, also has effect.
Q: What should I do if the rice is late?
Experts: There are three main methods for controlling rice glutinous glutinous rice: First, rational fertilization should be carried out to achieve the application of NPK fertilizers, especially the nitrogen fertilizer at the booting stage should not be excessively late, and the potassium dihydrogen phosphate foliar fertilizer should be properly sprayed at the later stage. Two suitable transplants, don't be too late. Third, we must choose crop varieties with shorter growth period.
Q: Is it better to apply nitrate-nitrogen fertilizer to crops or ammonium nitrogen fertilizer?
Expert: These two forms of nutrient fertilizer are easily absorbed by crops and are equally effective. However, the application of nitrate nitrogen fertilizer to paddy fields and sandy land is easy to fall with water, and it will also become a loss of gaseous nitrogen in paddy fields, but it is better for early spring topdressing and dryland topdressing in cold regions. Ammonium nitrogen fertilizer is not easy to be leached in the soil, and it can be used in both dry and paddy fields. However, it is easy to decompose and lose alkaline substances, so it is necessary to emphasize deep application of soil.
Q: What is the reason for the prismatic and hollow tomatoes in the greenhouse? How to prevent it?
Experts: The reasons for mature tomato hollow are more complicated and can be summarized into three categories: First, sudden changes in growth conditions, such as low temperature during fruit expansion, obstruction of nutrient water absorption in roots, or excessive potassium deficiency; in addition, tomato requires appropriate The temperature is 25 ° C during the day and 15 ° C at night. If it is lower than 5 ° C or higher than 30 ° C, especially at night, the fruit may develop abnormally. Second, the concentration of the growth regulator is too high. The third is that pollination is not good or the heart is too early. In view of these situations, the main methods to prevent the hollow shape of tomato fruit are: balanced fertilization and moderate irrigation, improvement of light and temperature conditions in the shed, reasonable pollination and timely picking, and strict control of the concentration of growth regulators such as hormones. These are all done, and high quality and high yield are guaranteed.
Q: I often see a shaped cucumber with a thick tail or a small tail and a large tail. What is going on?
Experts: The genesis of the shaped cucumber and the shaped tomato are similar, mainly related to the mutation of growth conditions. Therefore, as long as the water and fertilizer management is proper, the greenhouse temperature and temperature regulation, scientific pollination and rational use of growth regulators can be strengthened, the production of shaped fruits can be prevented.