4Effects of Potassium Levels on Growth and Development of Flue-cured Tobacco Seedings in the Floating System14-17
8Evaluation on Drug Effect of Joint Action of the Mixture of Two Kinds of Insecticide against Brevicoryne brassicae24-26
9Effect of Imidacloprid on Wheat Yield and Evaluation of Its Economic Dosage of Controlling of Wheat Aphids27-29
10Preliminary analysis on the characteristic of soil series of Kaifeng sample area in plain of East Henan by soil basement classification (Ⅰ)29-32
11Effect of water culture on some morphologic and physiologic characters of cutting seedlings of Gynura bicolor DC33-35