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

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Information Processing in Agriculture 2021年第3期8卷 419-436页

作者： Omotayo B.Adeboye Bart Schultz Amaka PAdeboye Kenneth O.Adekalu jimmy a.osunbitan Department of Agricultural and Environmental Engineering Obafemi Awolowo UniversityIle-IfeNigeria Land and Water Development IHE Delft Lelystadthe Netherlands

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 *** 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 *** experiments were conducted at the Teaching and Research Farms of Obafemi Awolowo University,Nigeria in the rainy seasons of 2015 and *** 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 *** data of the wetter year 2015,were used for calibration of the AquaCrop model because AquaCrop is water *** 2016 data were used for the *** AquaCrop model simulated canopy cover with R2 and EF>0.90,d-in-dex>*** model captured the trend of the soil water storage well,R2 and EF>*** AquaCrop model simulated soil water storage below wilting point for seasonal rainfall less than 600 mm,and it did not overestimate *** model predicted evapotranspirationwith R and EF>0.89,d-index=*** ground biomass was overestimated even though R2>***,nitrogen stress reduced seed yield and water productivity,there was no under or over estimation of the seed *** were predicted with low error under the different levels of nitrogen fertilizer,R>0.99,EF and d-index>*** 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 ***,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 *** recommend simulation of the effe

关键词： AquaCrop Soybeans Nitrogen fertilizer Process based model Nigeria

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Response of Amaranth to Irrigation and Organic Matter

引用

Journal of Agricultural Science and Technology(A) 2013年第2期3卷 131-139页

作者： jimmy Akinfemi osunbitan Department of Agricultural & Environmental Engineering Obafemi Awolowo University lle-lfe Osun State 220005 Nigeria

The study investigated the response of Amaranth to irrigation depth and irrigation interval as well as poultry waste incorporation. A replicated 4 ×3 × 3 factorial arrangement with treatments consisting of percent organic matter incorporation （0%, 2%, 4% and 6% by weight）, irrigation interval （1, 3 and 5 days） and irrigation depth （4, 6 and 8 mm） was used for the experiment which was conducted in pots in a green house. The result of the experiment showed that percent organic matter incorporation, irrigation interval, and irrigation depth significantly （P 〈 0.05） affected the dry matter yield of the vegetable. However, only the percent organic matter incorporation and irrigation interval were significant （P 〈 0.05） in their effects on the plant height. The highest plant height of 12.03 cm occurred when 2% organic matter was incorporated into the soil while the lowest plant height of 9.04 cm occurred with 6% organic matter incorporation. The maximum plant yield （47.44 kg/ha） occurred when 2% poultry litter was incorporated into the soil while the lowest plant yield （31.57 kg/ha） occurred with the control experiment. Irrigation interval of three days as well as irrigation depth of 6 mm resulted in the highest plant height and maximum dry matter yield of the vegetable. From the result of the experiment, the factor combination of 2% organic matter incorporation with 6 mm irrigation depth applied at three days irrigation interval resulted in the highest plant height of 16.7 cm above ground surface and maximum yield of 67.8 kg/ha.

关键词： Amaranth irrigation depth irrigation interval organic matter dry matter yield.

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