Anhui Provincial Key Laboratory of Nutrient Recycling

Hefei, China

Anhui Provincial Key Laboratory of Nutrient Recycling

Hefei, China
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Wu J.,Huazhong Agricultural University | Guo X.,Anhui Academy of Agricultural Sciences | Guo X.,Anhui Provincial Key Laboratory of Nutrient Recycling | Wang Y.,Anhui Academy of Agricultural Sciences | And 3 more authors.
Journal of Food, Agriculture and Environment | Year: 2011

In order to study the decomposition characteristics and nutrient release patterns of rapeseed and wheat straw, wheat (Triticum aestivum L.cv.) and rapeseed (Brassica napus) straws were all wrapped in net nylon bags and put on the soil surface or buried into the soil under different water regimes and straw mulching models in 2007 and 2008 growth seasons, respectively, to study the decomposition characteristics and nutrient release patterns of rapeseed and wheat straw. The results showed that the decomposition rate of straw was faster within the first 30 days and then slowed down until the end of the experiment. Under water-saving cultivation model, the decomposition rate of straw buried into soil was high up to 61.06% after 90 days. The cumulative decomposition rates of wheat and rapeseed straw were 48.88-59.95% and 50.88-61.06%, respectively. Under conventional cultivation model, the straws that were mulched decomposed faster than those incorporated into the soil did. For straw mulching, there was no significant difference on decomposition rates between the two cultivation models. When buried into the soil, the straw under water-saving cultivation model decomposed faster than under the conventional cultivation model. The sequence of nutrient release rates was K>P>N≈C. Release rates of wheat and rapeseed straw for C were up to 48.29-63.79% and 50.29-66.55%, for N 48.35-52.83% and 46.48-57.67%, for P 54.83-67.49% and 56.44- 75.64% and for K 91.98-95.99% and 92.31-96.24% after 90 days decomposition, respectively. The effect of cultivation model and incorporation method on N, P and C release patterns was similar and K release rate was more than 90% after 30 days decomposition. It indicated that on the basis of straw mulching, the water-saving cultivation model can increase straw decomposition and release of nutrients. At the same time, it also can prevent the loss of nutrients from the soil, prevent pollution and make the best use of water.


Wu P.-P.,Anhui Academy of Agricultural Sciences | Wu P.-P.,Anhui Provincial Key Laboratory of Nutrient Recycling | Wang J.-J.,Anhui Academy of Agricultural Sciences | Wang J.-J.,Anhui Provincial Key Laboratory of Nutrient Recycling | And 2 more authors.
Chinese Journal of Ecology | Year: 2015

A four-year field experiment was conducted to study the effects of different fertilization practices on soil total organic carbon (TOC), water-soluble organic carbon (WSOC), easily oxidizable organic carbon (EOC), and particle organic carbon (POC) in paddy field of white soil. The fertilization treatments included chemical fertilizer, chemical fertilizer plus farmyard manure, chemical fertilizer plus wheat straw, and chemical fertilizer plus green manure. The results showed that, compared with chemical fertilizer, the amendment of organic manure significantly increased the contents of TOC and labile organic carbon (LOC), and the highest contents of TOC, EOC and POC were found in chemical fertilizer plus wheat straw treatment, with increases of 19.6%, 67.4% and 15.7%, respectively. The content of WSOC in chemical fertilizer plus farmyard manure treatment was highest, with an increase of 60.9% as compared to the control. Different fertilization practices had greater effects on the proportion of EOC than on that of WSOC and POC. Compared with single chemical fertilizer, the amendments of wheat straw, farmyard manure and green manure significantly increased the carbon management index (CMI) by 17.6%-85.2%. Correlation analysis showed the relationships between TOC, CMI and LOC were significant or extremely significant, with correlation coefficients of 0.691-0.824 and 0.593-0.803, respectively. Different organic carbon components and CMI were significantly related to available nitrogen and potassium, while only WSOC was significantly related to available phosphorus, with a correlation coefficient of 0.816. Therefore, the amendment of organic manure can increase the contents of TOC, LOC and CMI in white soil. Compared with EOC and POC, WSOC may be more sensitive to the changes of fertilization practices in white soil. © 2015, Editorial Board of Chinese Journal of Ecology. All rights reserved.


Wang J.,Huazhong Agricultural University | Wang J.,Anhui Academy of Agricultural Sciences | Wang J.,Anhui Provincial Key Laboratory of Nutrient Recycling | Lu G.,Huazhong Agricultural University | And 7 more authors.
Nutrient Cycling in Agroecosystems | Year: 2015

In order to test the efficacy of conservation tillage and optimized fertilization on reducing N and P runoff losses, a 4-year (2007–2011) runoff plot experiment was conducted in the Chaohu Lake region, East China. There were four treatments including: (1) conventional tillage (CT, basal fertilization without mulch), (2) conventional tillage with straw mulching (CTS), (3) optimized fertilization (OPF, split applications) and (4) no-tillage with straw mulching plus optimized fertilization (NTS + OPF). Results showed that CTS and NTS + OPF exhibited significant reduction of seasonal runoff and soil losses compared with CT (P < 0.05). OPF decreased runoff by 6–10 and soil loss by 9–27 % in the various years, but differences were not always statistically significant. Interestingly, winter wheat and rapeseed yields were on average higher in the conservation tillage and optimized fertilization treatment than in the CT treatment. Compared with CT, CTS reduced N losses by 14–25 %, OPF by 12–21 % and NTS + OPF 20–28 %. Similarly, CTS reduced P losses by 20–32 %, OPF by 11–21 % and NTS + OPF by 23–30 %. NTS + OPF was the most effective treatment for reducing nutrient losses. The reduction of runoff volume was mainly responsible for the decreased nutrient losses. Our findings indicates that conservation tillage and optimized fertilization may reduce N and P losses via runoff while maintaining or enhancing crop yields during the winter-crop growing seasons in the Chaohu Lake region. © 2014, Springer Science+Business Media Dordrecht.


Wu J.,Anhui Academy of Agricultural Sciences | Wu J.,Anhui Provincial Key Laboratory of Nutrient Recycling | Wu J.,Huazhong Agricultural University | Guo X.,Anhui Academy of Agricultural Sciences | And 5 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

In order to study effects of tillage systems on crop yields and soil physical and chemical properties in wheat-rice rotation system, a long term (2007-2010) experiment was conducted. The results showed that compared with conventional tillage, the soil bulk density increased and soil water content decreased with no-tillage. But even without tillage, bulk density of the 0-10 cm soil layer was still suitable for the growth of crops. No-tillage enriched soil organic matter and total nitrogen in the surface soil layer. Both the soil organic matter and total N content of no-tillage were significantly higher in 0-10 cm layer and lower in 10-20 cm layer than that of conventional tillage. During the wheat season, the soil alkali N, available P and available K contents had the same trends with those of organic matter and total N. Whereas during the rice season, with no-tillage, the soil alkali N, available P and available K contents in 0-20 cm layer were lower than those of conventional tillage. The results also indicated that the treatment of no-tillage increased wheat yield, but significantly reduced rice production, and the key component of the yield was the effective panicle amount of wheat or rice. During the whole wheat-rice rotation system, the yields of wheat treated with no-tillage and the yield of rice treated with conventional tillage were 5.7% higher than wheat with conventional tillage and rice with no-tillage.


Wu J.,Anhui Academy of Agricultural Sciences | Wu J.,Huazhong Agricultural University | Wu J.,Anhui Provincial Key Laboratory of Nutrient Recycling | Guo X.,Anhui Academy of Agricultural Sciences | And 6 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2013

The decomposition characteristics of wheat straws and their effects on soil biological properties and nutrient status under different rice cultivation were studied in the 2007 and 2008 growth seasons, respectively. Wheat straws were wrapped in net nylon bags and embedded into the soil under conventional cultivation and a water-saving cultivation model. The rate of straw decomposition was greatest within the first 30 days and then decreased until the end of the experiment. Straw decomposition under the water-saving cultivation model was faster than straw decomposition under conventional cultivation, and the wheat straw cumulative decomposition rates were 48.9%-61.3%. The sequence of nutrient release rates were K> P>N≈C. The effect of the cultivation model and incorporation method on N, P and C release patterns followed almost the same trend as the decomposition of straw. Soil microbial biomass increased rapidly in the early growth stage after wheat straw was returned to the field, but decreased significantly in the middle growth stage and reduced slowly in the late growth stage. Urease, alkaline phosphatase and sucrase activities in the soil followed the same pattern as the microbial biomass after straw mulching. However, cellulase activity was different in that it increased rapidly in the early growth stage, improved slowly in the middle growth stage and decreased rapidly in the late growth stage. Microbial numbers and enzyme activities under the water-saving cultivation model were significantly higher than under conventional cultivation. Increasing the amount of wheat straw could improve microbial numbers and enzyme activities, but excessive straw would have a negative effect on bacterial and actinomycete numbers. The results also showed that soil nutrient contents could be improved noticeably by returning straw to the field. After straw mulching, organic carbon, total nitrogen, alkali-hydro nitrogen, and available phosphorus contents increased throughout the whole trial period. The available potassium content was highest after 30 days of straw mulching, and then decreased gradually. Nutrient contents under the water-saving cultivation model were higher than under conventional cultivation. Increasing the amount of straw had a positive effect on soil nutrient contents.

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