| Influence of planting date on some agronomic characters
of wheat I. Influence on period till heading Hosni A. MOHAMED Bahtim Experiment Station, Cairo; U. A. R. Nine wheat varieties of different origin and genetic constitution were selected for this study. The work was originally designed to study the influence of planting date on rust reaction. Agronomic characters were also considered and will be given in parts. Varieties of wheat used in this study were the commercial wheats Tosson, Giza 139, Giza 144, and Giza 145 and the imported wheats Ramona and Montana, which are used in our stations mostly as spreaders for stem rust ; all these varieties belong to Triticum vulgare. The commercial durums Baladi Bahtim and Baladi 116 and also Triticum timophevii represented the tetraploid group. Germination of T. timophevii seed was poor. Also this line did not head in most plantings. Wheat varieties were planted at Alexandria (in the northern part of the U. A. R.) and at Bahtim near Cairo (in the central part of the U. A. R.). Planting was each 20 days in 8 dates of planting at Alexandria and 13 dates of planting at Bahtim, starting September 22 at Alexandria and September 20 at Bahtim. Notes on heading were recorded considering 50% heading at Alexandria and first heading at Bahtim. Period was considered from planting date as seed were irrigated immediately after planting. On the other hand, it would be harder if period was calculated on the basis of germination. On this basis the period till heading was considered as from planting date. Temperature was obtained for both Alexandria and Bahtim and showed a decrease in maximum and minimum temperatures followed by an increase thereafter, which resembles the trend of the period till heading for most varieties. In general, results (Table 1) can be summarized as follows: 1. Varieties differ in the period till heading but they agreed in the fact that the period for each variety increased then decreased thereafter. Triticum timophevii did not head in all plantings except at Bahtim in the September 20 planting after 194 days from planting. 2. Comparing the period till heading in the different planting dates for each variety, the period was the longest at Alexendria in the October 12 planting for the varieties Baladi ll6 and Baladi Bahtim, the two tetraploids, and November 1 for the variety Montana and November 21 planting for the vatieties Tosson, Giza 139, Giza 144, Giza 145 and Ramona. At Bahtim the longest period was in the October 10 planting for the varieties Giza 145 and Baladi Bahtim and October 30 for the varieties Tosson, Giza 139, Giza 144, Montana, Ramona and Baladi 116. |
| --> Next |