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Growth yield and oil content of spring sunflower as influenced by nitrogen phosphorus potassium fertilizer application

Growth yield and oil content of spring sunflower as influenced by nitrogen phosphorus potassium fertilizer application

Pakistan Journal of Scientific and Industrial Research 30(2): 142-145

A study to determine the effect of NPK application at 0-0-0, 75-0-0, 0-50-0, 0-0-50, 75-50-0, 75-0-50-, 0-50-50 and 75-50-50 Kg NPK/ha, on the seed yield and oil content of spring sunflower was conducted on sandy clay loam soil having on an average 0.063 % N, 8.8 ppm available P2O5 and 224 ppm available K2O during the year 1984. The whole of N, P2O5 and K2O in the form of urea, SSP and SOP, respectively were applied at sowing in the respective treatments. The results revealed that the average seed yield increased from 18.84 quintals/ha without N to 26.45 quintals/ha with 75 Kg N/ha and a further increase to 27.77 quintals/ha with 50 Kg K2O/ha alongwith N was not significant. On the other hand seed oil content were reduced by 5.63 percent with the application of 75 Kg N/ha alone while addition of P, K or PK each at the rate of 50 Kg/ha to 75 Kg N improved the seed oil content almost to the level of unfertilized one. However, increase in seed yield as a result of N application led to an increase in oil yield/ha. It was further observed that addition of P&K to N did not contribute considerably towards increasing 1000-seed weight over N alone, while K application in combination with N played significant role in increasing the number of seed per head. The plant height increased significantly in plots fertilized with N, NP, NK and NPK over plots treated with P, K, PK or no fertilizer.

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