[Effect of monocalcium phosphate and potassium chloride on nitrogen leaching in paddy soil].
In this article, influence of monocalcium phosphate and potassium chloride application on nitrogen leaching in paddy soil of Taihu region was studied by soil column leaching. The results showed that nitrate nitrogen was the main component of nitrogen leaching without urea application which accounts for 93.39 percent of total nitrogen leaching (including urea, ammonium, and nitrate nitrogen). Amounts of urea, ammonium, and nitrate nitrogen in leachates increased significantly after urea application which account for 3.95, 15.25, and 80.80 percent of total nitrogen leaching respectively and for 0.26, 0.80, and 2.54 percent of applied nitrogen respectively. Amounts of urea, ammonium, and nitrate nitrogen in leachates were enhanced prominently by monocalcium phosphate or potassium chloride which are 4.54, 24.11, 71.34, and 3.45, 24.53, 72.02 percent of total nitrogen leaching respectively, and which are 0.39, 1.86, 3.34, and 0.32, 2.12, 4.06 percent of applied nitrogen separately. There is interactive influence on nitrogen leaching after application of monocalcium phosphate and potassium chloride together, and amounts of urea, ammonium, and nitrate nitrogen were 4.10, 27.35, and 68.55 percent of total nitrogen leaching, and 0.42, 2.60, and 4.26 percent of total applied nitrogen respectively. The leaching order of different form nitrogen followed as urea N > ammonium N > nitrate N, and leaching amounts of different form nitrogen followed as urea N < ammonium N < nitrate N.
Li
Shou-tian
ST
Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. shtli@issas.ac.cn
Zhou
Jian-min
JM
Wang
Huo-yan
HY
Du
Chang-wen
CW
Chen
Xiao-qin
XQ
D000641:Ammonia / Q000032:analysis; D002130:Calcium Phosphates / Q000737:chemistry*; D004357:Drug Synergism; D005308:Fertilizers; D009566:Nitrates / Q000032:analysis; D009584:Nitrogen / Q000032:analysis*; D011189:Potassium Chloride / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis; D014508:Urea / Q000737:chemistry
D002130:Calcium Phosphates; D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D012989:Soil Pollutants; D011189:Potassium Chloride; C485838:calcium phosphate, monobasic, anhydrous; D000641:Ammonia; D014508:Urea; D009584:Nitrogen