Application of the AquaCrop model in decision support for optimization of nitrogen fertilizer and water productivity of soybeans  

作　　者：Omotayo B.Adeboye Bart Schultz Amaka PAdeboye Kenneth O.Adekalu Jimmy A.Osunbitan 

机构地区：[1]Department of Agricultural and Environmental Engineering,Obafemi Awolowo University,Ile-Ife,Nigeria [2]Land and Water Development IHE Delft,Lelystad,the Netherlands

出　　处：《Information Processing in Agriculture》2021年第3期419-436,共18页农业信息处理（英文）

摘　　要：Modelling of the effects of water and different levels of nitrogen on evapotranspiration and water productivity of rainfed soybeans is very important in optimising resource use in the production of the crop.The objective of the study was to model evapotranspiration,soil water storage and water productivity of rainfed soybeans under different levels of nitrogen fertilizer by using the FAO AquaCrop model.Field experiments were conducted at the Teaching and Research Farms of Obafemi Awolowo University,Nigeria in the rainy seasons of 2015 and 2016.There were five levels of nitrogen,which are 00,25,50,75 and 100%of the recommended nitrogen applications and two varieties of soybeans,which produced a 2 by 5 factorial experimental design.The data of the wetter year 2015,were used for calibration of the AquaCrop model because AquaCrop is water driven.The 2016 data were used for the validation.The AquaCrop model simulated canopy cover with R2 and EF>0.90,d-in-dex>0.99.The model captured the trend of the soil water storage well,R2 and EF>0.70.The AquaCrop model simulated soil water storage below wilting point for seasonal rainfall less than 600 mm,and it did not overestimate it.The model predicted evapotranspirationwith R and EF>0.89,d-index=1.00.Above ground biomass was overestimated even though R2>0.98.Although,nitrogen stress reduced seed yield and water productivity,there was no under or over estimation of the seed yields.They were predicted with low error under the different levels of nitrogen fertilizer,R>0.99,EF and d-index>0.99.The AquaCrop model is suitable for simulating canopy cover,soil water storage,evapotranspiration,and seed yieldof rainfed soybeans with different levels of nitrogen fertilizer under temporal distribution of seasonal rainfall.Therefore,it can serve as a useful tool for smallholder farmers in predicting productivity of soybeans and optimising resource allocation,land and water use in the tropical farming systems.We recommend simulation of the effects of pest on biomass,seed yield and water prod

关 键 词：AquaCrop SOYBEANS Nitrogen fertilizer Process based model NIGERIA 

分 类 号：S14[农业科学—肥料学]