【摘要】 本文用Ｎ￣（１５）标记水稻和绿肥研究了稻田土壤－作物－家畜系统中氮的循环。Ｎ￣（１５）标记稻草喂羊，羊体回收饲料稻草Ｎ３１．１６％，羊粪２８．２６％，羊尿５．７２％，总回收６５．１４％，损失３４．８６％。将羊粪尿单施，稻谷回收饲料稻草Ｎ３．１９％，水稻全株回收４．８２％，土壤残留１９．００％，损失１０．１４％。故羊体、水稻及土壤残留共回收饲料稻草Ｎ５４．９８％．将羊粪与尿素配施，则饲料稻草Ｎ的总回收率为５５．８８％。Ｎ￣（１５）标记绿肥喂猪；猪体回收饲料绿肥Ｎ２３．５１％．猪粪２３．８５％，猪尿２８．７６％，总回收率７６．１２％，损失率２３．８８％。将猪粪、尿还田，稻谷回收饲料绿肥Ｎ６．６９％，水稻全株回收１０．０５％，土壤残留１９．１７％，故猪体、水稻和土壤残留共回收饲料绿肥Ｎ５２．７３％，将猪粪与尿素配施，则饲料绿肥Ｎ的总回收率为５２．７５％。更多还原

【Abstract】 his paper deals with the use of N￣(15)-labelled rice straw and green manure to study the cycle of N in the crops-domestic animal-paddy soil system.When a N￣(15)-labelled rice straw was used to feed goats. the total N recovery was 65.14%, including 31. 16%in bodies,28. 26%in feces and 5.72% in goat urine.Then the goat feces and urine were retuned topaddy field and 4.82%N￣(15) was recovered in whole rice plants ,inciuding 3. 19%in ricegrain,19.0%of N remained in soil ,and 10.14%of N was lost.In the two processes of feed-ing goats and planting rice ,a total 54.98%of N were recovered , including those in goatbodies, uptake by rice and remainder in soil.If goat feces were apploed in combination with urea to rice field a total 55.88%of would be recovered .When N￣(15)-labelled green manurewas used to feed pigs, 23.51% of the fed green manure N were recovered in pig bodies ,23. 85%in feces and 28. 76%in urine ,with a total N recovery of 76.12% and a N loss of23. 88%。 In the case of applying pig feces and urine alone to rice field 6. 69%of the fedgreen manure N was recovered in rice grain , 10. 05%was recovered in whole rice plant(in-cluding grain),19. 17%remained in soil and 23. 39%was lost during rice growing and the to-tal N recovery was 52.73%. Under the condition of applying pig feces in combination withurea,the total N recovery of this model was 52.75%.更多还原