Barley crude protein content reduces gradually with growing, the fastest reduced rate is about 40%-50% from middle vegetative period to booting stage.

粗蛋白质含量呈现逐渐下降的趋势，从营养中期到抽穗期下降的幅度最高，达40%—50%。

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At the same time, the working period is reduced, the reinforced bar saved and the qualification rate raised. And it is simply operated without open fire and pollution thus worth popularizing.

同时，缩短了工期、节约了钢筋、提高了合格率，而且操作方便、无明火、无污染。

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