4Effects of plant densities on accumulation of dry matter and population trends of Tanshan 21 under the high yield condition16-18
10Culture tecnique with high yield and high efficiency of relaying planting system- cotton after onion32-33
14Studies on repelling action of extracts from 9 species of plants against Plutella xylostella L.40-42
17The application of integrated chemical regulation technique in fostering of vegetable seedlings48-50
20The diaghosis and prevention of chickling infections bursal disease virus and streptococcicosis coinfection disease57-58