| Abstract: | The objective was to study the behaviour of 20 dwarf wheats in a field trial under irrigated situation and also to suggest parameters or group of parameters conducive to high yield. Considerable variability existed in respect of tillering and earing, LAI, net photosynthetic rate, total dry matter production rate (TDMPR), harvest index, number of grains per main and subsidiary ears and grain size (1000 grain weight). Number of grains per main and subsidiary ears, total grains per plant, rate of net photosynthesis, leaf area and harvest index as well as total dry matter production rates were found to be positively correlated with grain yield and as such contributed maximum towards grain yield.
Thus, in general, it may be concluded that there should be minimum reduction in grain numbers between the main ear and the subsidiary ears, for this seems to be the one of causes of reduction in grain yield. Besides, there ought to be high ratio between net photosynthetic rate and dark respiration because large amount of dry matter is otherwise lost through respiration and many not be available for grains. High harvest index and high biological yield are also desirable characters which may be combined to obtain higher yields in wheats. |
