Mineral nutrition and reproduction in Hevea: effects of nitrogen fertilisation on flowering and fruiting in immature trees of some clones
1986
Ghandimathi, H. | Sivanadyan, K.
A field investigation was undertaken to ascertain the influence of nitrogen manuring on flowering and fruiting of clones RRM 600, PB 260 and PB 235, and flowering of PB 330. The study was conducted in existing fertiliser trials, on young trees of about three years old. Flowering and fruiting twigs, inflorescences and fruits were visually counted on the trees. Some fruits were also harvested. Heavy nitrogen applications, at rates significantly higher than amounts hitherto recommended for growth, generally induced flowering in the young trees. Flowering intensity, measured in terms of frequency of trees in flower, number of flowering twigs per tree and number of inflorescences per tree was generally increased. This effect appeared more marked in a late-flowering clone like RRIM 600 than in PB 260, which has a natural propensity to initiate early flowering. The large nitrogen dressings also increased the frequency of fruiting trees, number of fruiting twigs per tree and total number of fruits per tree. As with flowering, the positive influence of heavy nitrogen manuring on fruiting was more effective in the poor seeding clone RRIM 600, than in the profuse seeder PB 260.
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