Effect of top dressing of compound fertilizer containing nitrate (ammonium nitrate sulfate) on paddy rice
1988
Kim, J.J. | Jang, Y.S. (Kangwon National Univ., Chunchon (Korea R.). Coll. of Agriculture) | Cho, B.O. | Huh, B.L. (Kangwon Provincial Rural Development Administration, Chuncheon (Korea R.))
An ordinary paddy variety Hwaseong and a high-yielding variety Samgang were taken under investigation to test the effect of top dressing of newly formulated three compound fertilizers on rice plants at sprouting heads. The fertilizer formula used were C. F. 1(14-0-14; NO3-N and NH4-N) and C. F. 2(14-0-14; NH4-N only) and C. F. 3(14-0-14+OM 10%; NO3-N and NH4-N). A field experiment was conducted on a plot of Gyuam series. Hwaseong variety exhibited 5-10% yield increase on the plots with application of 2nd compound fertilizer (1) and (2) compared to straight fertilizer of (1) and (3). Fertilization with 2nd and 3rd compound fertilizers gave the best result when it is done 15 days before heading. A yield increase of 3-5% was achieved when the fertilization was done 20 days before heading in the case of Samgang variety, but no beneficial effect was observed with an application 10 days before heading. Rate of barren grains was at the minimum in the compound fertilizer (2) plots of both Hwaseong and Samgang varieties. Content of NO3-N in soils and grain yield appeared to be positively correlated(r=0.618). No significant differences in Eh values were measured among reduced paddy soils. The compound fertilizer of (2) presented the best result in yield increases regardless of rice variety. The rate of barren grains in both varieties was observed at the minimum of the application of compound fertilizer of (2). No great difference of mineral contents was detected among plants from different treatments
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