Wang S.,China Agricultural University |
Huang G.,China Agricultural University |
Huang G.,Chinese Israeli International Center for Research and Training in Agriculture |
Yang J.,Ningxia Academy of Agro Forestry Science |
And 3 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010
To obtain the suitable alternative of saline water irrigation for spring wheat, a field experiment was conducted in Huinong Irrigation District, Ningxia, North-West China in 2007 and 2008 respectively. The collected datum were used to analyze the effects of saline water irrigation on water-salt dynamics and yield of spring wheat. Results indicated that soil water content and salinity at the upper layer of 0-30 cm had relatively large variations, whereas the variations of soil water content and soil salinity in layers below 30 cm were relatively small. Canal irrigation resulted in the desalination of root zone soils, while well-canal combined irrigation kept the salinity in root zone soils being stable even at relatively dry years, but irrigation with well water caused a significant salt accumulation in root zone soils. Evapotranspiration and water use efficiency of spring wheat decrease with the increase of irrigation water mineralization degree. Compared with Canal irrigation, the well-canal combined irrigation only led to a slight decrease of crop yield, whereas a 20%-30% decrease of crop yield was caused by the well irrigation. The alternative with 1:1 ratio of ground water to surface water is recommended for irrigation of spring wheat in Yinbei Huinong Irrigation District.
Yang S.-Q.,Chinese Academy of Agricultural Sciences |
Yang S.-Q.,Key Laboratory of Agro Environment and Climate Change |
Han R.-Y.,Chinese Academy of Agricultural Sciences |
Han R.-Y.,Key Laboratory of Agro Environment and Climate Change |
And 5 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2016
Water pollution is severe in Ningxia irrigation zone and water quality is classified as Inferior Category V in many of drainage ditches. The main pollutants are nitrate and ammonium. A 5-year swine manure application trial and nitrate leaching losses have been conducted. There are 3 treatments: traditional without manure (CK), traditional matched manure 4500 kg/hm2(T1) and traditional matched manure 9000 kg/hm2 (T2). Nitrate nitrogen leaching losses at 30, 60, 90 cm soil layers have been measured by resin core method. The results indicate that swine manure application cannot obviously increase soil nitrate leaching losses at 30cm layer. Contrasting with CK (15.96±0.41) kg/hm2, T1 (16.85±0.40) kg/hm2 and T2 (17.01±0.46) kg/hm2 do not reach significant differences (P<0.05), the same result as at the 60 cm layer. However there are significant differences between treatments and CK and no significant differences between T1 and T2 at 90 cm layer. Manure application can increase soil organic matter and total nitrogen. SOM of T1 and T2 are increased 0.95 and 1.41g/kg, which are improved 7.50% and 11.13%. TN of T1 and T2 are increased 0.06 and 0.16 g/kg at 0~30cm layer, which are improved 7.72% and 22.04%. Manure application can increase crop yield, rice yield is increased 12.26%~11.55%, but also winter wheat yield is increased 9.32%~12.52%. © 2016, Chinese Society for Environmental Sciences. All right reserved.
Chen Z.,Chinese Academy of Agricultural Sciences |
Chen Y.-Y.,CAS Research Center for Eco Environmental Sciences |
Gao J.,Chinese Academy of Agricultural Sciences |
Liu R.-L.,Ningxia Academy of Agro Forestry Science |
And 2 more authors.
Chinese Journal of Applied Ecology | Year: 2015
Agricultural soil has become the largest anthropogenic source of atmospheric nitrous oxide (N2O). To estimate the impacts of long-term combined application of organic and inorganic fertilizers on N2O emission in a typical winter wheat-oil sunflower cropping system in the Ningxia irrigation area, we measured N2O fluxes using the static opaque chamber-gas chromatograph method and monitored the seasonal dynamics of related factors. Our results showed that nitrogen addition in the previous crop field significantly stimulated N2O emissions during the following oil-sunflower cultivation, and the mean fluxes of N300-OM, N240-OM1/2, N300 and N240 were (34.16±9.72), (39.69 ±10.70), (27.75 ±9.57) and (26.30 ±8.52) μg·m-2 ·h-1, respectively, which were 4.09, 4.75, 3.32 and 3.15 times of the control groups. The total cumulative N2O emissions of fertilizer treatments in growing season was as high as 796.7 to 1242.5 g·hm-2, which was 2.99 to 4.67 times of the control groups. During the growing season, the rates of N2O emission in each month organic and inorganic fertilizers combined treatments were similar at high levels. N2O emission in chemical fertilizer treatments gradually decreased, and the main period of N2O emission occurred at the beginning of growing season. Taking July for example, N2O emission accounted for 41.3% to 41.8% of total cumulative amount. The amounts of N2O emission under organic and inorganic fertilizers combined treatments were significantly higher than under chemical fertilizer treatments. The N2O emissions were not significantly different between conventional and optimized applications of nitrogen fertilizer under the same fertilizing method, either between N300-OM and N240-OM1/2, or between N300 and N240. On account of the drought, N2O emission in each treatment was mainly affected by soil moisture. N2O emission had a significant positive correlation with soil ammonium nitrogen content under combined applications of organic and inorganic fertilizers, but was not correlated with soil nitrate nitrogen content under all treatments. This showed that adding organic fertilizer could stimulate the N2O production via increasing the soil ammonium nitrogen content. ©, 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved.
Liu R.-L.,Chinese Academy of Agricultural Sciences |
Liu R.-L.,Ningxia Academy of Agro Forestry Science |
Li Y.-H.,Ningxia Academy of Agro Forestry Science |
Zhang A.-P.,Chinese Academy of Agricultural Sciences |
And 5 more authors.
Chinese Journal of Applied Ecology | Year: 2012
By using seeding-box total fertilization technology, a two-year field plot experiment was conducted to study the effects of applying medium rate of controlled-release urea fertilizer(MN, 80 kg N·hm-2), high rate of controlled-release urea fertilizer(HN, 120 kg N·hm-2), and conventional urea fertilizer(FP, 300 kg N·hm-2) on rice yield and nitrogen loss. As compared with FP, HN did not decrease rice yield significantly, and MN and HN increased the two-year average nitrogen use efficiency(NUE) by 26.2% and 20.7%, respectively(the NUE in treatment FP was 33.2%). In treatment FP, the total N concentration in surface water peaked after 1-3 days of urea application; while in treatments MN and HN, the total N concentration in surfate water peaked after 7-9 days of urea application, and was significantly lower than that in treatment FP throughout the rice growth period. The nitrogen leaching loss in treatment FP mainly occurred at tillering stage, while that in treatments MN and HN delayed to tillering-flowering stage. In all treatments, the NO3 --N loss accounted for 59.7%-64.2% of the total N loss. HN decreased the total N leaching loss by 51.8%, as compared with FP.
Li D.,Ningxia Academy of Agro Forestry Science |
Chen L.,Ocean University of China |
Chen L.,CAS Qingdao Institute of Oceanology |
Xia Y.,Ocean University of China |
And 7 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014
The biochar technology has become a promising technology for soil amelioration due to its multiple agricultural and environmental benefits. Biochar sample (BC) and BC-based amendment was developed, and added into the poor quality soil (light Sierozem) collected from Ningxia Hui Autonomous Region with the rates of 0,1.5%,3% and 5%, respectively. Chinese cabbage Zhongbai 78 (Brassica chinensis) was chosen as the test plant, and the effect of BC and AD on its growth, yield and nitrogen (N) and phosphorus (P) utilization efficiency was investigated, as well as rhizosphere effect. The results indicated that the cabbage height and yield significantly increased in BC and AD treatmens, and more significant in AD treatment compared with that of BC. These positive effects is possibly due to the direct nutrient contributions from BC and AD, as well as the enhanced rhizosphere effect resulted from adding of BC and AD. The N utilization efficiency was enhanced in both BC and AD treatments, but P utilization efficiency was enhanced only in AD treatments. Therefore, BC and AD may be used as the poor quality soil amendments to improve nutrient utilization efficiency and thus to increase crop yield.