排序方式： 共有1条查询结果，搜索用时 0 毫秒
1
1.
Yadvinder-Singh R. K. Gupta H. S. Thind Bijay-Singh Varinderpal-Singh Gurpreet-Singh Jagmohan-Singh J. K. Ladha 《Biology and Fertility of Soils》2009,45(7):701-710
Poultry litter (PL) is an important nutrient source; however, no information is available regarding its value in supplying
N and P in rice–wheat (RW) production. A three-year field study was conducted at Ludhiana, Punjab, India on a loamy sand soil
to identify optimum combination of PL and N and P fertilizers for a sustainable RW production. The litter was applied to rice
at 5 Mg ha−1 as a single application and supplemented with different rates of N. The residual effect of PL and the direct effects of the
different combinations of N and P were studied in the following wheat. Nitrogen and P mineralization from PL was studied under
controlled conditions in the laboratory, and macronutrient input–output balances were estimated from field results. About
46% of the N from PL was released after 60 days of incubation. The release of P from the PL occurred mainly during the initial
20 days after incubation, accounting for 15–17% of the total P. Combining PL with fertilizer N (40 kg ha−1) increased rice yield and nutrient uptake similar to what was obtained with the application of recommended fertilizer N (120 kg
ha−1). In the following wheat, the residual effect of PL was equal to 30 kg N ha−1 and 13 kg P ha−1. After three annual cropping cycles and PL application, mean soil organic C increased by 17%, Olsen-P by 73%, and NH4OAc-extractable-K by 24%. Most treatments had positive P but negative K balances. About 11% of the net P balance was recovered
from the soil as Olsen-P. The study showed that optimum N and P fertilizer doses for an RW system receiving 5 Mg ha−1 of PL are 40 kg N ha−1 for rice and 90 kg N + 13 kg P ha−1 for the following wheat. Safe and effective management of PL should be based on P balance, particularly when regular applications
of PL are to be made in the RW system. 相似文献
1