Latex 피복요소시용(被覆尿素施用)과 고온(高溫)이 건답직파(乾畓直播) 벼의 질소이용효율(窒素利用效率)과 수량(收量)에 미치는 영향 = Effects of Application of Latex Coated Urea on Yield and N-Use Efficiency of the Direct Seeding Rice on Dry Paddy Field in the Year of High Temperature

다국어 초록 (Multilingual Abstract)

To investigate the changes of $NH_4-N$ in soil, nitrogen uptake by rice plant, nitrogen use efficiency and rice yield by the application of Latex Coated Urea(LCU) on direct seeding rice, rice was planted on paddy field, Jeonbuk series at the Honam area, from 1996 to 1997. Nitrogen in LCU applied as basal dressing in whole layer was dissolved almost untill non-productive stage. Thus, nitrogen deficiency symptom appeared and N in shoot was 1.75% showing 28.1 of SPAD value at heading stage. However percentage recovery of fertilizer N was higher in LCU than with urea application. Top dressing of urea at panicle initiation stage in addition to basal dressing of LCU, increased rice yield by 9%. Conventional split application of urea on the surface decreased the percentage recovery of fertilizer N to 56.9% of whole layer application plot.