　　 First, how to improve the carbon ammonium fertilizer effect of hydrogen carbonate according to the extremely volatile, the general utilization rate of Han 25% . The following four methods can be used to improve the application effect.
1 . It is best to use the ammonium carbonate once. If it is not used, it is necessary to tighten the mouth of the bag to prevent evaporation and reduce fertilizer efficiency.
2 . Carbon is used as rice top dressing. In the case of shallow water, it should be combined with mash to mix it with the field mud to improve utilization.
3 . The ammonium bicarbonate is applied to the dry field for seedling fertilizer, and can be applied to the cave. The depth of the hole is about 10 cm, and the effect is good.
4 . The crops of orange stalks are crushed, the first 100 kg plus 5 kg of ammonium bicarbonate, mixed into the mud slurry, accumulated into compost or into the pond, can speed up the speed of ripening and improve fertilizer efficiency.
Second, the yield of phosphorus and late cotton pest discharge cotton growth late foliar spray phosphorus, can compensate for lack Uptake phosphorus, promote seed full full, increased boll weight, earlier boll opening; Further, cotton leaves often induced secretion of calcium oxalate moths The role of eggs, resulting in the increase of the number of eggs in the cotton bollworm, sprayed with superphosphate, drunk and calcification into calcium oxalate, loss of moth-proof effect, can greatly reduce the damage of cotton bollworm. Specific Usage: From late August, per acre with l% to 3% superphosphate 75 kg was sprayed cotton leaves, spray once every 7 days, 2 to 3 times continuous spraying. Note that the concentration should not be too large to prevent damage to the blade.
Third, the addition of superphosphate manure stacked manure can prevent nitrogen loss, especially when stacked human animal manure, often smell the pungent odor of ammonia, which is volatile ammonia stone manure, not only pollutes the air, And the nitrogen nutrients in the manure are also lost. However, if in the process of stacking the manure, according to the crop fertilizer, superphosphate adding a small amount, and then stirred for a uniform retting, not only prevents volatilization of ammonia, added nitrogen, sulfur, calcium nutrient manure, It can also reduce the fixation of phosphorus and facilitate the absorption of crop seedlings. The use of such fertilizers in greenhouses also prevents the fermentation of manure in the shed to produce ammonia damage to vegetables. In addition, the critical period in the seedling P nutrition in general, so as basal fertilizer to be administered. Manure is also generally applied as a base fertilizer. After the two are mixed and stacked, it is more convenient to use.
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