Uptake of nutrients by rice plant in relation to growth

Rao, V.Seetharama

Andhra Agric Journal of India 9(5): 254-274


Accession: 014290258

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Uptake of N, P, Ca, Fe, Mn, Cu, Zn, and B was studied with 2 medium-duration rice varieties, HR. 19 and HR. 104. The growth curve as measured by dry matter is typically sigmoid in shape. N, P, Zn and Bfollow closely the growth curve, whereas the absorption of Ca, Fe, and Mn is completed soon after the vegetative phase. There are at least 2 peak rates of absorption, one coinciding with the vegetative phase and the other with the development of the panicle. This is true for N, P, Zn and B. In the case of Fe, the 1st peak seems to occur in the nursery itself and 2nd at the vegetative phase. In the case of Ca, Mn and Cu there is only 1 peak corresponding to the vegetative phase. Redistribution of absorbed nutrients between the stem and the panicle were studied. N, P, Zn and B accumulate preferentially in the seed. The other elements, Ca, Fe and Mn stay behind in the straw. Cu occupies an intermediate position. The absorption characteristics of HR. 104, an indica-japonica cross while following the general pattern of HR. 19, shows some distinctive differences, such as very late tillering and consequent renewed absorption of all nutrients except Mn and Ca even after the milk stage. It is not known whether this is something characteristic of the variety or is brought about by environmental conditions. There is no significant difference in the absorption of the nutrients, in the vegetative phase, between the 2 varieties. However, the difference in the amounts absorbed subsequently between the post-tillering and the milk stage is very different. HR. 104 absorbs nearly twice as much N in that period and this is reflected in the yield which is about 1.74 times that of HR. 19. Since the majority of trace elements (Fe, Mn and Cu) are absorbed early in the life cycle of the plant, an early application is recommended. The possible explanation of Mn toxicity is also discussed. Possible deficiency of Cu and Zn under conditions of ferrous sulphide precipitation is pointed out.