Abstract

                                The principle of manurial trial or in fact the principle underlying any form of agronomic experiment is to get a bigger yield per unit area. We only measure the end result of the treat- ment and we had no clear idea until recently as to how this increased yield is brought about. Developmental studies on the rice plant undertaken in Coimbatore have shown that the two important attri- butes to yield are (1) the number of tillers or ears per plant and (2) the number of grains per ear. A proper understanding of the influ- ence of environment which includes the different forms of manurial trials, on these two developmental phases of the plant is extremely important. A number of experiments have been conducted recently in the rice stations and while the fuller details of these experiments are published in the station reports an outline of the salient features are given in this note.

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