Analysis on Optimum Sowing Date of Maize in Jinzhou Using Crop Growth Model and Optimum Season Method

doi:10.3969/j.issn.1000-6362.2016.01.009

Abstract

Abstract:

To investigate the maize optimum sowing date under the average climate pattern in Jinzhou as well as evaluate the adaptability of crop growth model method and optimum season method, three years’ experimental data collected during 2011-2013 growing season conducted in Jinzhou crop site was employed in this study to validate the cultivar parameters and evaluate the model. Eight planting dates were simulated using 30 years of historical weather data from Jinzhou meteorological observational site to analyze the effect of different sowing dates on maize yield. Optimum season method was also used to investigate the optimum sowing date of maize in this site. An improved method was proposed to improve the ability of optimum season method. The evaluation of CERES-Maize showed that the model was able to simulated penology and grain yield accurately, with normalized RMSE less than 10.3%. The sowing date analysis showed that a delayed planting date from April 30 to May 10 caused an increase in average yield of 6%. Maize median yield decreased from 9112kg·ha-1 to 8619 kg·ha-1 when planting date delayed from May 10 to May 30. The yield of sowing date at 10 May had no significant difference with that of sowing at 20 April and 25 April. The optimum sowing date determined by optimum season analysis method was delayed, comparing to that determined by the crop model method and actual planting date. So an improved method was proposed, which took the unfavorable temperature during grain filling into account. Then the results were accordance with the real situation. In conclusion, the optimum sowing date of maize in this region was from 25 April to 10 May. The results could provide a reference and scientific basis for determining optimum sowing date of maize.

Key words: CERES-Maize model, Optimum sowing date, Optimum season method

Institute of Atmospheric Environment, China meteorological Administration (Shenyang), Shenyang 110166, China. Analysis on Optimum Sowing Date of Maize in Jinzhou Using Crop Growth Model and Optimum Season Method[J]. Chinese Journal of Agrometeorology, 2016, 37(01): 68-76.

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