New Page 4 关键词：灰色GM(1，1)模型；双向差分建模；作物产量预测 [gap=448]Key words： the grey model GM(1,1);two direction difference;output of crop forecasting
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粮食作物产量预测是一个非常复杂的知识推理过程。
Foodstuff yield prediction is a very complicated reasoning process.
联合国开发计划署官员说他们提供的最复杂的设备是作物产量预测设备。
UNDP officials say the most sophisticated thing they provided was crop-forecasting equipment.
作物产量预测是农业科学研究的一个重要内容，是农业决策的重要依据，不少学者进行了大量研究并建立了许多预测模型。
Crop yield forecasting is an important field of agricultural scientific research and provides an important base for agricultural decision. Many forecasting models have been put forward and set up.
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