Soil-pit Method for Distribution and Leaching Loss of Nitrogen in Winter Wheat's Soil, Weishan Irrigation District

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Zhao, Erni^1 ; Xu, Lirong^1 ; Wang, Rongzhen^1

School of Resources and Environment, University of Jinan, Jinan

250022, China^1

关键词: Ammonium nitrogen;    Environmental pollutions;    Fertilizer applications;    Irrigation amounts;    Irrigation and fertilizers;    Irrigation districts;    Nitrogen leaching;    Utilization ratios;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/3/032016/pdf
DOI  :  10.1088/1755-1315/108/3/032016

来源: IOP

【 摘 要 】

Unreasonable application of irrigation and fertilizer will cause the waste of water and nitrogen and environmental pollution. In this paper, a series of soil-pit experiments were carried out to study the distribution and leaching loss of nitrogen in winter wheat's soil. The results showed that NO3-concentration at 20-80cm depth mainly responded to fertilizer application at the beginning of field experiment, but the amount of irrigation became the dominant factor with the growth of winter wheat. It is noteworthy that the distribution of NO3-was mainly affected by the amount of fertilizer applied at the depth of 120-160cm in the whole period of growth of winter wheat. The accumulation position of NH4+was deepened as the amount of irrigation increased, however, the maximum aggregation depth of ammonium nitrogen was no more than 80cm owing to its poor migration. It can be concluded that the influence of irrigation amount on the concentration of NH4+in soil solution was more obvious than that of fertilizer. Compared with fertilizer, the amount of irrigation played a leading role in the utilization ratio of nitrogen and the yield of winter wheat. In summary, the best water and fertilizer treatment occurred in No.3 soil-pit, which meant that the middle amount of water and fertilizer could get higher wheat yield and less nitrogen leaching losses in the study area.