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hriaata pmea, cv. Pusa Bold, and ft campestm, cv. Pusa Kalyani, were raised under field conditions with varying leiels of N supply from 0-120kgha"'. The production profile of branches and pods thereon was measured, per unit area basis, throughour rhe crc^ ontogeny. At maturity, data on the yield contributing characters, viz. pod dry weight, pod number, seed nvimber per pod. ifKX) seed weight, seed wall ratio and seed jiekl in different order branches, was recorded.The branching pattern and the number of pods pr4>duced on different order brariches, in the rwo species, was favourably modified by the increasirig levels of N supply. Primary arid secondary branches contrihuted to the seed yield to an extent of 80 °/i. of the total yield. Nitrogen treatment had no significant effect on 100 (> seed weight. B.juncea exhibited significandy higher yield over B. campestris. N supply up to 120 kg ha' ' linearly increased seed yield in both the species. However, it exerted a ne^tive effect on partitioning of assimilates feim pod wall co seed. The study indicated that rape.seed-mustard, grown under short winter-season environment with adequate soil moisture, has the potential for higher N-feniliier optima exceeding 120 kgha"'. fey words: Growth, N supply, rapeseed-mustard, seed yield, yield contributiiig characters.

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Harvest index has become a character used in plant breeding programmes and in evaluation of responses to agronomic treatments (Donald & Hamblin, 1976). Donald (1962) defined harvest index as the ratio between weight of grains and the weight of total dry matter, and later described it as a measure of partitioning of photo - synthates (Donald, 1968)