1 should not be used immediately after watering urea . Urea is soluble fertilizer, mobile and strong , can easily cause the loss . Dryland Sashihouqie avoid watering immediately , should not be applied before the rain .
2 bicarbonate should not be applied to the table . Ammonium bicarbonate highly volatile , making it easy to burn seedlings, it should not be applied to the table , it is best to open Goushen Shi , Shi after casing .
3 bicarbonate should not be administered in a greenhouse and shed . There are known as gas fertilizer ammonium bicarbonate , administered in a greenhouse and shed , easy and rapid decomposition of ammonia volatilization resulting greenhouse crops suffer.
4 . Ammonia nitrogen fertilizers do not mix with alkaline fertilizer applied . Ammonium bicarbonate , ammonium sulfate , ammonium nitrate , ammonium phosphate and other alkaline substances encountered ammonia nitrogen fertilizer will cause the loss of nitrogen. Avoid the ash , kiln dust and other alkaline potash fertilizers and lime nitrogen mixed application .
5 Do nitrate fertilizer application in paddy fields . Ammonium nitrate fertilizer solution out of the plasma nitrate ions , paddy soils susceptible to deep water washout loss arising from denitrification , resulting in nitrogen loss .
6 sulfate should not be long-term administration. Ammonium sulfate is a physical acidic fertilizer application on a separate piece of land will increase soil acidity , soil physical damage to the structure , long-term administration in alkaline soil , also due to residual sulfuric acid reacts with calcium ions in the soil , the soil compaction stiff.
7 . Fertilizer application should not disperse . Phosphorus mobility of small , easily absorbed fixed lower soil fertility. Application of phosphate fertilizer and soil should reduce the contact area , the best use of Summer and fertilizing , centralized facilities in recent root.
8 potash crop should not be administered in the late . Potassium has the old leaves from the lower part of the crop , and transferred to the top of the tender part of the re-use characteristics, so potassium deficiency symptoms compared to nitrogen, phosphorus late. Therefore , potash should be applied early in the crop growth stage , or one for basal fertilizer .
9 Avoid long-term application of fertilizers containing chlorine and chlorine Crops avoid bogey . Long-term administration of potassium chloride alone , will increase the accumulation of chloride ions in the soil , resulting in structural damage and acidification of soil nutrients . On sugar cane, sugar beet , watermelon , tobacco and other crops avoid chlorine application will reduce the quality and quality.
10. Nitrogen fertilizer should not be used extensively for legume crops. There are nitrogen-fixing rhizobia near the roots of crops soybeans, peanuts, green beans , broad beans, peas, alfalfa , etc. If a large number of application of nitrogen fertilizer , manure is not only wasteful , but also inhibit the activity of rhizobia , reducing its nitrogen-fixing properties.