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首页> 外文期刊>Zeitschrift fur Bewasserungswirtschaft >Modeling alfalfa hay yield as affected by applied water and irrigation uniformity
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Modeling alfalfa hay yield as affected by applied water and irrigation uniformity

机译：受施用水和灌溉均匀性影响的苜蓿干草产量建模

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摘要

The present study aims to evaluate two crop water production models on alfalfa (Medicago sativa L.) hay yield estimates. The models were found between the actual to maximum yield ratio and the two parameters of the sprinkler water uniformity and the gross to required irrigation depth ratio. Measured data from three experimental plots of a farm located in Varamin, a semi-arid region of Iran, were used for the evaluation of the proposed models. Comparisons showed that the results from both models werein good agreement with experimental results. However, the results obtained from the normal water distribution model were more accurate than those from the uniform water distribution model. The higher predictive accuracy of the normal distribution model may be due to the fact that it follows a normal pattern in terms of irrigation and crop yield distributions. The accuracy of models in estimating alfalfa hay yield improved with increasing sprinkler water uniformity. The findings illustrate that normal and uniform models overestimate and underestimate the values of crop yield compared to measured values, respectively. The average difference in the yield estimation compare to measured data was 130 kg ha~(-1) for the uniform distribution model and 87 kg ha~(-1) for the normal distribution model. The average alfalfa hay yield over growing period was estimated at 24382 kg ha~(-1) for the ranges of sprinkler water uniformity between 80-90 % in the study region.
机译：本研究旨在评估苜蓿（Medicago sativa L.）干草产量估算的两种农作物水分生产模型。在实际产量与最大产量之比与喷头水均匀度以及总灌溉深度与所需灌溉深度之比这两个参数之间找到了模型。来自位于伊朗半干旱地区瓦拉明的一个农场的三个实验地块的测量数据被用于评估所提出的模型。比较表明，两种模型的结果均与实验结果吻合良好。但是，从正常水分配模型获得的结果比从均匀水分配模型获得的结果更准确。正态分布模型的较高预测精度可能是由于其在灌溉和农作物产量分布方面遵循正态分布这一事实。随着喷头水均匀度的提高，估计紫花苜蓿干草产量的模型的准确性也有所提高。研究结果表明，正常模型和统一模型分别高估和低估了作物单产值与测量值。对于均匀分布模型，产量估算与测量数据的平均差异为130 kg ha〜（-1），对于正态分布模型为87 kg ha〜（-1）。在研究区域中，喷水均匀度在80-90％之间，估计整个生长期苜蓿干草的平均产量为24382 kg ha。（-1）。

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