Efficiency Of Using Sealed Nitrogenous Fertilizer On Paddy Fields

The total volume of chemic fertilizers used in China was more than that in USA in 1994. The dosage per hectare utilizing chemic fertilizer in China was only lower than that in France, Britain, USA and Germany. The level of using chemic fertilizer in China was in the first rate in the world, but the utilizing efficiency was very pool because the improper instruction, unreasonable fertilizer structure, and heavily depending on Nitrogenous fertilizer. The more dosage and low utility efficiency lead to the serious problems of environment pollution, such as, the damage of soil structure, heavily pollutions to agriculture produce, the deep water pollution with nitrate, damage of ozone layer, nutrient water of lake.The sealed fertilizers can be easily controlled when they release nutriments. The advantages make them meet the requirements of rice growth in different stages. Those fertilizers also apparently decrease losing of nitrogenous fertilizer and nitrification and re nitrification,and free of damage to crop.Application of sealed fertilizers can reduce the nitrate nitrogen and ammonium nitrogen. Under the low temperature, only very few of nitrogen is released from the granules of nitrogenous of fertilizer. Most nutriment still keep in the granules. So the lose is limitedOnce application of sealed fertilizers can meets the total requirements of rice growth from seedlings to harvest. Farmers can obtain higher yields even if they applying the half of usually dosages because of the utility efficiency reach to 37.8-64.4%. Sealed fertilizers can apparently increase the available fringes of rice. Sealed fertilizers used as bottom application are free of baked seedlings, saving labor and preventing agglomeration of urine fertilizer. It is benefit to machined agriculture and increasing economic efficiency.So, sealed fertilizers can reduce the half dosage of nitrogenous fertilizer and the labor utility. It can largely reduce the cost and pollution of chemic fertilizers under the condition of stable output of rice. Those fertilizers are of great valuable in promotion. One tip must written here is that the bottom application should be under the proper volume, otherwise, they will postpone the transferring from vegetarian periods to propagation.