采用随机区组设计方法，研究了达尔丰喷施时期和喷施量对玉米产量和其它经济性状的影响。

By using randomized-block design of two factors, the effects of Daerfeng fertilizer and spraying date on maize yeild and other economic characteristics were studied.

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本文简介了丰度模型、齐波夫律、特征分析、信息量与隶属函数等方法，并对其中某些方法有所改进。

In this paper, several methods such as abundance pattern, Zipf's Law, characteristic analysis, information content and subordinate function are briefly introduced and Some of them are improved.

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通过大田试验，研究了不同供钾方式对烟叶含钾量的影响及提高石灰性土壤上烤烟含钾量的可能途径。结果表明，施钾能显著提高烟叶产量，其中以粉肥结合喷优丰处理效果最好。

Field experiment was conducted to study the effect of different supplying styles of potassium fertilizer on potassium content in flue-cured tobacco leaves and the methods to increase the content.

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