Contribution of Fertilization to Accumulative Crop Yield and Soil Fertility in Heilu Soil Region of the Loess Plateau
Author:
Affiliation:

Clc Number:

Fund Project:

Supported by the National Natural Science Foundation of China (No. 41661072) and the Special Innovation Funds of Gansu Academy of Agricultural Sciences in China (No. 2017GAAS26 )

  • Article
  • |
  • Figures
  • |
  • Metrics
  • |
  • Reference
  • |
  • Related
  • |
  • Cited by
  • |
  • Materials
  • |
  • Comments
    Abstract:

    【Objective】Contributions of fertilization to crop yield and soil fertility are key parameters in evaluating whether the fertilization practices are reasonable or not. In order to provide some scientific basis for decision-making in fertilizing and developing sustainable agriculture in the Heilu soil region of the Loess Plateau, this paper tried to explore in-depth contribution of fertilization to crop yield and soil fertility in a long-term stationary field experiment in the region, relative to treatment.【Method】The long-term experiment, which has been carried on since 1978, was designed to have six treatments, that is, CK (no fertilizer), N (single chemical fertilizer of N), NP (chemical fertilizers of N and P), SNP (straw and chemical fertilizers of N and P), M (single organic manure) and MNP (organic manure and chemical fertilizers of N and P).【Result】Results show that accumulative yields of wheat and maize were significantly and positively related to the number of years the crops had been cultivated in all the treatments with determination coefficients R2 being all higher than 0.95. The crop of maize and wheat in treatment MNP, SNP, NP and M reached 8 856, 7 089, 7 226, 7 043 kg·hm-2 and 4 916, 3 747, 4 132 and 3 868 kg·hm-2, respectively, in mean annual yield, significantly higher than that in the control (CK). However, among the four treatments, treatments SNP, M and MNP were similar to or higher than treatment NP. The relationships between the contribution of N fertilizer and P fertilizer to accumulative yield and the number of years of cultivation could be well fitted by quadratic concave function and convex function, respectively. In treatments NP and SNP, the contribution was significantly and positively related to the number of years of cultivation, reaching 3 407 and 2 191 kg·hm-2, respectively with maize 429 and 208 kg·hm-2 respectively with wheat, in accumulative yield. Treatments MNP and SNP significantly increased the contents of soil organic matter and total nitrogen, while treatments CK and NP slightly increased the content of soil organic matter only, and treatment NP almost had no impact on soil total nitrogen. Treatment NP significantly increased soil Olsen-P content, while treatment MNP significantly increased the content of soil Olsen-P content and the content of available potassium, as well.【Conclusion】All the findings listed above suggest that long-term balanced application of chemical fertilizers, application of organic manure, application of chemical fertilizers coupled with straw returned, and application of chemical fertilizer in combination of organic manure all can increase crop yields and improve soil fertility quality, that the suitable fertilizer application rate should be N 90 kg·hm-2 and P2O5 75 kg·hm-2, and that in fields where straw returning is adopted, P fertilizer could be applied once every two years in the Heilu soil area of the Loess Plateau, China.

    Reference
    Related
    Cited by
Get Citation

E Shengzhe, DING Ningping, LI Lili, YUAN Jinhua, CHE Zongxian, ZHOU Haiyan, SHANG Laigui. Contribution of Fertilization to Accumulative Crop Yield and Soil Fertility in Heilu Soil Region of the Loess Plateau[J]. Acta Pedologica Sinica,2019,56(1):195-206.

Copy
Share
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
History
  • Received:March 01,2018
  • Revised:June 29,2018
  • Adopted:July 20,2018
  • Online: October 25,2018
  • Published: