Abstract

With the object of finding out the influence of temperature and fertiliser usage for different times of planting a field experiment was carried out with IR.8 rice for 24 months covering two calender years 1971-72, 1972-73 with four levels, of fertilisers viz., 148:70.70. 185:87:87; 222:104:104 and 259:121:121 Kg NPK/ha. The results revealed that moan tempe- rature prevailed during flowering to maturity had significant influence on grain yield and the positive correlation boing 0.859, Planting in February was superior to other planting months followed by January, March and July. Fertiliser levels had no influence on grain yield and the lowest level viz 148.70:70 NPK/ha is suitable under continuous cropping condition i.e, in rice-rice-rice rotation. Of the yield components, filled spkielets and 1000 grain weight had influence on grain yield. Whereas panicle number had no influence.

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