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将用~(15)N示踪法标记的草木樨株体施入白浆土中,种植三茬作物,每年测定~(15)N回收率,三年后测定土中~(15)N残留量。结果表明,第一年氮素释放量最高,占三年总释放量的3/4。三茬作物植株回收的~(15)N与土中残留的~(15)N总和接近100％。
(15) N recovery was measured every year and ~ (15) N residual in soil was measured after three years the amount. The results showed that the highest nitrogen release in the first year, accounting for three-year total release of 3/4. The total amount of ~ (15) N recovered from the three cropping plants and the residual amount of ~ (15) N in the soil is close to 100%.