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 treatme...

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Autores principales:	Zhiyi Zhang, Dongbi Liu, Maoqian Wu, Ying Xia, Fulin Zhang, Xianpeng Fan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ea5664880897444fa1e2351c4231f452
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spelling	oai:doaj.org-article:ea5664880897444fa1e2351c4231f4522021-11-21T12:17:07ZLong-term straw returning improve soil K balance and potassium supplying ability under rice and wheat cultivation10.1038/s41598-021-01594-82045-2322https://doaj.org/article/ea5664880897444fa1e2351c4231f4522021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01594-8https://doaj.org/toc/2045-2322Abstract 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 (NPK1/2S); 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 soil potassium supply and K balance. Long-term K surplus (4 or 5 years), compared with NPK, the NPKS significantly increased non-special K adsorption (Knsa) and non-exchangeable K (Kne) by 5.7–11.2 mg kg−1 and 65.7–128.1 mg kg−1, respectively. Q/I relationship showed cropping without straw K or without fertilizer K resulted in lower quantity (nonspecifically and specifically held K i.e. – ∆K0 and Kx) and intensity (equilibrium activity ratio i.e. CR0 K) of K in tested soils. K-fertilization with straw maintain higher exchangeable K (EK0) and a higher difference between EK0 and minimum exchangeable K(EKmin), and would help to prevent depletion in non-exchangeable pool of soil K under intensive cropping. Additionally, The straw return mainly decreased potential buffering capacity for exchangeable pool (PBCK n), 43.92–48.22% of added K in soil might be converted to exchangeable pool while it was 25.67–29.19% be converted to non-exchangeable pool. The contribution of exchangeable K towards plant K uptake would be higher in the soil with straw than the soil without straw and the non-exchangeable K would be the long-term fixed K as a supplement to the potassium pool. K fertilizer with 6000 kg h m−2 straw return in each crop season increased soil available K and slowly available K. The findings underlined importance of the straw return and contribution for sustain K supplying ability of soils.Zhiyi ZhangDongbi LiuMaoqian WuYing XiaFulin ZhangXianpeng FanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zhiyi Zhang Dongbi Liu Maoqian Wu Ying Xia Fulin Zhang Xianpeng Fan Long-term straw returning improve soil K balance and potassium supplying ability under rice and wheat cultivation
description	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 (NPK1/2S); 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 soil potassium supply and K balance. Long-term K surplus (4 or 5 years), compared with NPK, the NPKS significantly increased non-special K adsorption (Knsa) and non-exchangeable K (Kne) by 5.7–11.2 mg kg−1 and 65.7–128.1 mg kg−1, respectively. Q/I relationship showed cropping without straw K or without fertilizer K resulted in lower quantity (nonspecifically and specifically held K i.e. – ∆K0 and Kx) and intensity (equilibrium activity ratio i.e. CR0 K) of K in tested soils. K-fertilization with straw maintain higher exchangeable K (EK0) and a higher difference between EK0 and minimum exchangeable K(EKmin), and would help to prevent depletion in non-exchangeable pool of soil K under intensive cropping. Additionally, The straw return mainly decreased potential buffering capacity for exchangeable pool (PBCK n), 43.92–48.22% of added K in soil might be converted to exchangeable pool while it was 25.67–29.19% be converted to non-exchangeable pool. The contribution of exchangeable K towards plant K uptake would be higher in the soil with straw than the soil without straw and the non-exchangeable K would be the long-term fixed K as a supplement to the potassium pool. K fertilizer with 6000 kg h m−2 straw return in each crop season increased soil available K and slowly available K. The findings underlined importance of the straw return and contribution for sustain K supplying ability of soils.
format	article
author	Zhiyi Zhang Dongbi Liu Maoqian Wu Ying Xia Fulin Zhang Xianpeng Fan
author_facet	Zhiyi Zhang Dongbi Liu Maoqian Wu Ying Xia Fulin Zhang Xianpeng Fan
author_sort	Zhiyi Zhang
title	Long-term straw returning improve soil K balance and potassium supplying ability under rice and wheat cultivation
title_short	Long-term straw returning improve soil K balance and potassium supplying ability under rice and wheat cultivation
title_full	Long-term straw returning improve soil K balance and potassium supplying ability under rice and wheat cultivation
title_fullStr	Long-term straw returning improve soil K balance and potassium supplying ability under rice and wheat cultivation
title_full_unstemmed	Long-term straw returning improve soil K balance and potassium supplying ability under rice and wheat cultivation
title_sort	long-term straw returning improve soil k balance and potassium supplying ability under rice and wheat cultivation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ea5664880897444fa1e2351c4231f452
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Long-term straw returning improve soil K balance and potassium supplying ability under rice and wheat cultivation

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