Long-term straw returning improve soil K balance and potassium supplying ability under rice and wheat cultivation.

ABSTRACT: The aims of the present study were to provide scientific bases for rational use of crop straw to substitute chemical potassium (K) input. The effects of potassium fertilization and straw incorporation on soil K balance and K supplying in a long-term (14 years) field experiment. Five treatments were examined: (1) no fertilization (CK); (2) mineral fertilizing (NPK); (3) straw 6000 kg h m^-2 (S); (4) NPK with straw 3000 kg h m^-2 (NPK_1/2S); and (5) NPK with straw 6000 kg h m^-2 (NPKS). K composition, K balance and quantity-intensity (Q/I) relationship were studied. Under no fertilization or low straw returned conditions, soil K was unbalanced and deficienct seriously. Straw return at 6000 kg h m^-2 per season with fertilization improved the

SUBMITTER: Zhang Z 

PROVIDER: S-EPMC8593129 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature