Why should be more P less N in the hot and dry summer?


 First:Fertilizer varieties
Multi-P fertilizer, phosphate fertilizer on the one hand at a higher temperature can be more effectively used to produce good fertilizer efficiency; the other hand, phosphate fertilizer can improve the utilization of water in the soil, play a mutual promotion role. Also sufficient phosphorus, can improve the utilization of nitrogen, so the phosphorus plays a role in promoting nitrogen. 
Reduce the amount of N fertilizer applied, especially vulnerable to decomposition of carbon ammonia, etc., because the heat easily decomposed carbon ammonia and high concentrations of nitrogen fertilizer easily lead to crop burning.

Second: Fertilizer quantity
In the high temperature and dry season, under the irradiation of bright light, the temperature of bare ground can reach 50 ℃, evaporation is strong, the concentration of surface water solution increases sharply, then if the application of the same fertilizer and normal weather, crop production can not only maintain or Increase production, and is likely to cut production.
For example, when precipitation is moderate, maize is fed with 12 kg of pure nitrogen per acre, which may result in high yields. If the same amount of fertilizer is still present at high temperatures and drought, it is at risk of cutting production. There are farmers to reflect last year's high temperature and drought, Pterodactyls fertilization level the same as the previous year, the results of Pterodactyls subtract yield is not increased, not fertilizers but higher than the yield of fertilization.

Third: Fertilization time
Morning fertilization, although the staff feel more comfortable, but with the rise of the sun, the temperature rose sharply, the water was quickly evaporated, crop absorption time is short, low fertilizer utilization; 
Noon fertilization, due to high temperature, not conducive to fertilizer Absorption and personnel operation; 
Evening fertilization, both suitable for personnel operation, but also to compensate for the shortcomings of short crop absorption time (because the evening is a process of reducing the temperature, surface water evaporation weakened, water retention time is long), is the best fertilization time.