Effects of Improvement by Mass Selection on the Different Maize Synthetic Populations Effects of Population Improvemetn on Grain Weight Per Plant and Ears Per Plant as Well as Plant Height by Using Tal Gene in Wheat Study on Improvement Effects of Population (Zhong Zong 2) of Half-sib Recurrent Selection Improvement Effect of MS1 and MS1-HS Recurrent Selection on Maize Population ZZ4 Ⅰ.Changes of Major Agronomic Traits Studies on the Application of Modified HS Reciprocal Recurrent Selection in Maize Population Improvement The Application of Spcific PCR Marker of 1Dx5 Subunit in Population Improvement for Wheat Quality Characters Improvement Effect of MS1 and MS1-HS Recurrent Selection in Maize Population ZZ4.