It can be a large number of melamine, urea-formaldehyde resin, hydrazine hydrate, tetracycline, phenobarbital, caffeine, reductive brown BR, phthalic LAN B, phthalates, monosodium glutamate and other products of production raw materials.
Adjust the amount of flowers
In order to overcome the apple-size year, in the case of a small annual, 5-6 weeks after anthesis (the critical period of Apple Flower bud differentiation, the new tip grows slowly or stops, leaves the nitrogen content is decreasing trend) foliar spraying 0.5% urea water solution, even spray 2 times, can increase the leaf nitrogen content, accelerate the new shoot growth inhibit flower bud differentiation, make the flower quantity suitable.
Flower Sparse Fruit
The flower of peach tree is more sensitive to urea, but the reaction is slower, so the use of urea to peach and nectarine in foreign countries to have a sparse fruit and flower test, the results show that peach and nectarine flower sparse fruit, need a greater concentration (7.4%) to show good results, the most suitable for the concentration of 8%-12%, spray after 1-2 weeks, that can achieve the purpose of thinning fruit. However, in different land conditions, different periods and different varieties of reactions need to be further tested.