Satit Areerak

Nakhon Sawan Field Crops Research Center

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The corn productivity of 5 soil series including, Takhli, Thab-Kwang, Wang Hai, Samo Thod and Lop-Buri were studied. Seven corn hybrids and one open-pollinated varieties were tested for grain yield and agronomic traits under these soil series in 1997 early and late rainy season at Nakhon Sawan Field Crops research Center. The experimental design used was a randomized complete block design with 4 replications.

For the experiment conducted in early rainy season, an interaction between the series of soil and varieties of corn was observed in grain yield. There was a highly significant difference between grain yield of corn under different soil series. The soil of Takhli series produced the highest corn grain yield of 1,230 kg/rai, where as Thab Kwang, Wang Hai, and Samo Thod series produced a 1,093; 934;and 822 kg/rai, respectively. The lowest grain yield was observed in Lop-Buri series. In comparison between all combinations of different soil series and corn varieties, the combination of Takhli series and a corn hybrid “CG 5445” produced the highest grain yield of 1,410 kg/rai. Different soil series were observed to be compatible with different corn hybrids. Takhli series was suitable for CG 5445, CPDK 888, Cargill 922, Pioneer 3013, and SW 3601; Samo Thod series was suitable for Pioneer 3013; SW 3601; and NSX 9210, Wang Hai series was compatible with CPDK 888; Pacific 300; Pioneer 3013; SW 3601 and NSX 9210; where Thab Kwang series was compatible with CPDK888; Pioneer 3013 and SW3601.

For the experiment conducted in late rainy season, there was no interaction between the soil series and corn varieties in grain yield. However, a highly significant difference between grain yield of corn under difference soil series was observed. Corn grain yield on Takhli, Lop-Buri, Wang Hai, Thab Kwang, and Samo Thod series were 1,195;1,180; 1,060; 1,036; and 755 kg/rai, respectively. There was also a highly significant difference between the tested corn varieties. The highest mean grain yield of 1,231 kg/rai was observed from CG 5445 in comparison to 935 kg/rai of check variety “NSX 9210”

Satit