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在应用~(15)N标记稻草喂羊和~(15)N标记绿肥喂猪,以羊粪和猪粪尿分别与~(15)N标记稻草和绿肥还田后,研究了~(15)N的转化和去向.本文着重研究饲料P、K的消化率及稻草、绿肥、羊粪和猪粪尿中的P、K对水稻的效应,主要结果如下:(1)稻草和绿肥分别饲喂山羊和猪,羊对饲料中P、K的消化率分别为3.9％和52.4％;猪对绿肥P、K的消化率分别为13.1％和54.6％。(2)羊粪单施。水稻对其P、K的利用率优于稻草单施:当与无机NPK配施时,二者P、K的利用率均提高。水稻对羊粪P的利用率比稻草高,K的利用率则相反。(3)猪粪单施,水稻对其P、K利用率低干绿肥单施,但与无机NPK配施后,水稻对猪粪P、K的利用率都高于绿肥。(4)猪粪与无机NPK配施或单施,水稻对其P、K的利用率均高于羊粪的相应处理。
(15) N labeled straw and green manure were applied to the pigs and the sheep and pig manure were used to inoculate them with ~ (15) N labeled straw and green manure. N conversion and fate.The main purpose of this paper is to study the effects of P and K on the digestibility of P and K and the effects of P and K on rice in straw, green manure, sheep manure and pig manure. The main results are as follows: (1) The digestibility of P and K in feedstuffs of goats, pigs and goats were 3.9% and 52.4%, respectively. The digestibility of P and K to green manure was 13.1% and 54.6% respectively. (2) Sheep single application. The utilization rate of P and K in rice was better than that in straw alone. When combined with inorganic NPK, the utilization of P and K increased. Rice utilization rate of sheep manure P is higher than that of straw, K utilization rate is the opposite. (3) Single application of pig manure and rice had only low application rate of P and K to dry green manure alone. However, with the application of inorganic NPK, the utilization rate of P and K to pig manure was higher than that of green manure. (4) Utilization of pig manure and inorganic NPK or single application, the utilization rate of P and K in rice was higher than the corresponding treatment of sheep manure.