6The Relationship between the Population Dynamics of Spring Wheat Aphids and Climatic Factors in Ningxia Irrigating Area17-19
7Difference between maize dwarf mosaic virus and maize rough dwarf virus and the control technique20-21
8Studies on the Method of Determining the Dissolving Rate of Controlled Release Nitrogen Fertilizer and Its Application22-24
13A new Chinese chive variety Pingfeng 1 and its culture technique for high yield and high profits30-31