Agricultural Research Institution

Xindi, China

Agricultural Research Institution

Xindi, China

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Li W.X.,Huazhong Agricultural University | Lu J.W.,Huazhong Agricultural University | Li F.B.,Guangdong Institution of Eco environment and Soil Science | Wang Y.,Guangdong Institution of Eco environment and Soil Science | And 2 more authors.
Science China Life Sciences | Year: 2011

The sudangrass (Sorghum sudanense) and ryegrass (Lolium multiflorum L.) rotation is an intensive and new cropping system in Central China. Nutrient management practices in this rotation system may influence soil fertility, the important aspects of which are soil biological properties and quality. As sensitive soil biological properties and quality indicators, soil microbial community activity, microbial biomass, enzyme activities, soil organic matter (SOM) and total N resulting from different fertilization regimes in this rotation system were studied through a four-year field experiment from April 2005 to May 2009. Treatments included control (CK), fertilizer phosphorus and potassium (PK), fertilizer nitrogen and potassium (NK), fertilizer nitrogen and phosphorus (NP) and a fertilizer nitrogen, phosphorus and potassium combination (NPK). Soil microbial community activities in the NK, NP and NPK treatments were significantly lower than those in the CK and PK treatments after the sudangrass and ryegrass trial. The highest microbial biomass C, microbial biomass N, SOM, total N, sucrase and urease activities were found in the NPK treatment, and these soil quality indicators were significantly higher in the NK, NP and NPK treatments than in the PK and CK treatments. Soil microbial biomass and enzyme activities were positively associated with SOM in the sudangrass and ryegrass rotation system, indicating that fertilization regimes, especially N application, reduced microbial community activity in the soil. Proper fertilization regimes will increase microbial biomass, enzyme activity and SOM and improve soil fertility. © 2011 Science China Press and Springer-Verlag Berlin Heidelberg.


Li W.,Huazhong Agricultural University | Lu J.,Huazhong Agricultural University | Seneweera S.P.,University of Melbourne | Chen F.,International Plant Nutrition Institute | And 2 more authors.
Journal of Food, Agriculture and Environment | Year: 2010

The sudangrass (Sorghum sudanense) and ryegrass (Lolium multiflorum L.) rotation is a new and more intensive cropping system which has developed rapidly in recent years along Yangtze River in China. However, the optimum nutrient management measures for this new system are lacking. Here, we present a detailed study of the effects of NPK fertilizers on yield and quality of forage, nutrient uptake and soil properties in this rotation system through a three-year field experiment conducted in Jianghan Plain from April 2005 to May 2008. The results showed that the NPK combination obviously improved the yield of sudangrass and ryegrass. Total yields in NPK treatments were 162.7, 114.8 and 145.6 Mg ha-1 in the three years, respectively, and were obviously higher than PK, NK, NP and CK treatments (P < 0.05). In addition, NPK fertilization also improved quality and the nutrient uptake of forage grasses, and N, P and K uptake for NPK treatments was higher than for other treatments. Nutrient output for forage grasses meant the depletion of soil nutrient, and NPK combination fertilization maintained nutrient balance and soil fertility in this intensive cropping system, also decreased excess nutrient in soil. So the proper combination of NPK fertilizers assured higher yield and soil fertility in the more intensive cropping system and provided reference for alleviating availably the contradiction between food security and resource shortage.


Li W.,Huazhong Agricultural University | Lu J.,Huazhong Agricultural University | Lu J.,Agricultural Research Institution | Li X.,Huazhong Agricultural University
Indian Journal of Agricultural Sciences | Year: 2011

The sudangrass (Sorghum sudanense) and ryegrass (Lolium multiflorum L.) rotation is a new type of cropping system in central China. A field study of effects of inorganic fertilizers (NPK) on yield of forage, accumulation of C, N and P in grass and soil fertility in this rotation was conducted through a four-year field experiment from April 2005 to May 2009. The treatments consisted of control (CK), fertilizer P and K (PK), fertilizer N and K (NK), fertilizer N and P (NP) and fertilizer N, P and K combination (NPK). For four years, proper fertilization (NPK treatment) increased yield of sudangrass and ryegrass by 17.2%-23.1% compared to the NP treatment, increased by 20.2%-26.8% compared to the NK treatment, and were 2-4 times higher than that of CK and PK treatments. The accumulation of C, N and P in NP (fertilizer N, P), NK (fertilizer N, K) and NPK (fertilizer N, P, K) treatments were 118.8%-173.5%, 269%-468% and 48.7%-157.5% higher than those of the CK treatment, respectively, while PK treatment was similar to CK treatment. At the end of the experiment, organic C, total N and P in soil in the NPK treatment were 14.6%, 18.4%, 36.6% higher than those of the CK treatment, respectively. The proper combination of NPK fertilizers could assure crop yield and sustainable soil productivity.

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