Abstract
A field experiment was conducted to study tie influence of different doses of nitrogen fertilizer on grain filling, grain yield and yield components of two wheat (Triticum aestivum L.) varieties under warm dry conditions, Data on grain filling rate (GFR) and grain filling duration (GIT) were obtained from successive samples collected after anthesis. With increasing nitrogen application there was almost a linear increase in grain yield and various yield components of both the varieties. Grain filling rate (GFR) was positively influenced by_LN application and medium level (120 kg N ha ) gave the maximum GFR. Grain development in the lower part of the spike responded more to N application. Grain filling duration, however, remained unchanged at all levels of N used.
Cultivars differed significantly area and various yield compon suggest that it should be simultaneously improve MFR and without lengthening the GFD.
INTRODUCTION
in GFR, leaf ent5. Results possible to grain weight
Grain yield in wheat is the result of tb€ number of effective tillers, the number of grains per spike and the ..grain weight. The grain number and weight in spike are ;determined after anthasis and are strongly influenced by environmental factors (Sinha and Aggarwal, 1980) and :Availability of photosynthates (Sayed and Gandorah, 1984)4 :Assimilation and partitioning of photosynthates in relation to grain growth are therefore, of vital importance.
