| Simulation of yield and soil desiccation effects of continuous spring maize under different level fertilization treatments in Jinzhong semiarid areas of the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2008.01.01 |
| Key Words: loess plateau spring maize WinEPIC model crop yield fertilization treatment |
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| Abstract: |
| Based on model validation?the WinEPIC model was used to simulate yield and soil desiccation effects of continuous spring maize under different level fertilization treatments in Jinzhong semiarid areas of the Loess Plateau．The simulated results show as following：（1） Crop yield of continuous spring maize under no fertilization low fertilization?medium fertilization and high fertilization treatment decreased significantly with fluctuation?and the average yield was1．484t／hm2?1．768t／hm2?2．129t／hm2and2．337t／hm2respectively；（2） Simulated monthly available soil water content of all4fertilization treatments declined with annual and seasonal fluctuations?and the average annual decreasing rate was5．6mm?8．4mm?8．4mm and11．4mm separately and strong soil desiccation and differences of available soil water content among fertilization treatments occurred during the5beginning years of the simulation?and differences of soil water content among no fertilization low fertilization and medium fertilization?as well as high fertilization treatments were very significant；（3）Soil moisture decreased and desiccated soil layers thickened gradually at the beginning of simulation?and stable desiccated soil layers occurred during middle and end of simulation．Distribution depth of desiccated soil layers was1～2m of no fertilization treatment?1～3m of both low and medium fertilization treatments?and 1～4m of high fertilization treatments?and indicated that desiccated soil layers thickened with the increasing of fertilization and crop yield；（4） Soil water carrying capacity of dryland spring maize field at Jinzhong is1．868～2．154 t／hm2?and its fertilization application amount is N45～60kg／hm2and P15～55kg／hm2． |