Yield Stability of Commercial Hybrid Maize in Thailand
In Thailand, approximately 95％ of maize seed grown are hybrids commercially produced by many seed companies. These companies offer many hybrids to farmers and, therefore, there is huge competition for the large market share in seed business. In the public sector, maize hybrids were continuously approved and the new hybrids offer more choice to the farmers. Consequently, the Thai farmers gain advantages by having various hybrids to choose. To evaluate the yield potential and yield stability of 16 hybrids from private companies and public sectors, an experiment was carried out during the rainy season 2004 in a randomized complete block with four replications at four environments in the maize belt of Thailand. The results revealed that the varieties had highly significant differences in yield potential with coefficient of variation ranging from 5.7％～significant. In this study, the deviation from regression of the variety mean square was more important for estimating yield stability than the regression of the variety mean on the environmental index. Thirteen hybrids produced 10％～25％ higher yield than check variety, NS72 (7.6t/ha). A desirable variety is the one with a high mean yield, a unit of regression coefficient (b=1) and the least deviation from regression. Therefore, four out of the thirteen hybrids i.e. KS×4452,30A33, BIG 949, and NK48 were found to produce consistently high yield (P<0.05) over the test environments.
Maize Hybrids Yield performance Yield stability
Parinya Sebunruang Ratchada Pratchareonwanich Anon Malipan Annop Kasivivat Preecha Sangsoda
Nakhon Sawan field Crops Research Center, Takfa, Nakhon Sawan 60190. Thailand Nakhon Ratchasima Service Center for Crops and Production Resources, Nakhon Ratchasima 30340. Thaila Lop Buri Service Center for Crops and Production Resources, Lop Buri 15210. Thailand Phetchabun Service Center for Crops and Production Resources, Phetchabun 67000. Thailand Loi Service Center for Crops and Production Resources, Loi 42000. Thailand
国际会议
第九届亚洲玉米大会(the Ninth Asian Regional Maize Workshop)
北京
英文
350-352
2005-09-05（万方平台首次上网日期，不代表论文的发表时间）