1. FAO: World Programme for the Census of Agriculture 2020: Vol.1 - Programme, Concepts and Definitions. Food and Agriculture Organization of the United Nations, Rome, Italy (2020)
2. Fernandez, J.A., DeBriun, J., Messina, C.D., Ciampitti, I.A.: Late-season nitrogen fertilization on maize yield: a meta-analysis. Field Crop Res 247, 1–11 (2020)
3. Ogori, A.F.: Source, extraction and constituents of fats and oils. Journal of Food Science and Nutrition (2020)
4. Simtowe, F., Makumbi, D., Worku, M., Mawia, H., Rahut, D.B.: Scalability of Adaptation strategies to drought stress: the case of drought tolerant maize varieties in Kenya. Int. J. Agr. Sustain 19, 91–105 (2020)
5. Ma, D.K., Yin, L.N., Liu, Y.J., Yang, W.J., Deng, X.P., et al.: A meta-analysis of the effects of nitrogen application rates on yield and water use efficiency of winter wheat in dryland of loess plateau. Sci. Agric. Sin. 53, 486–499 (2020). (in Chinese with English abstract)