Effect of NPK Fertilizer Doses on Production and Productivity of Local Rice (Oryza sativa L.) Cultivars of Nagaland under Upland Rainfed Condition

Author: T. Gohain and Sentirenla Changkija and Khrawbor Dkhar

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Abstract

An experiment was carried out during kharif season of 2019 and 2020 in the Agronomy Research farm of SASRD, Medziphema campus, Nagaland. The treatments consisted of factorial combination of four local rice cultivars viz., Gwabilo ssu, Hoikha, Ronga shea, Semvu shea and an improved dwarf variety Sahbhagi dhan (check) with four fertilizer doses viz., F0- 0:0:0 NPK kg ha-1: F1- 30:15:15 NPK kg ha-1: F2-60:30:30 NPK kg ha-1 and F3- 90:45:45 NPK kg ha-1 laid out in a Randomized Block Design with 3 replications. The result of the study showed that the application of 60:30:30 NPK kg ha-1 enhanced the growth and yield of all the four local rice cultivars. While a higher dose of 90:45:45 NPK kg ha-1 resulted in better performance of the improved dwarf variety both in terms of growth and yield being more by nature. The highest value for grain yield, harvest index and benefit cost ratio was recorded with the improved variety Sahbhagi dhan which was statistically at par with the local cultivar Semvu shea. While the highest production efficiency as well as nutrient uptake was recorded for cultivar Semvu shea. Hence from the experiment it can be concluded that the local cultivar Semvu shea with a fertilizer dose of 60:30:30 NPK kg ha-1 is equally efficient with the improved variety Sahbhagi dhan @ 60:30:30 NPK kg ha-1 proving its superiority over the other local cultivars and its capability to perform as good as the improved check variety with adequate nutrient management and care.

Keywords

Local rice cultivars, Yield, Nutrient uptake, Production efficiency, Economics

Conclusion

Among the local rice cultivars under experiment, cultivar Semvu shea recorded a comparatively higher yield with fertilizer dose @ 60:30:30 NPK kg ha-1 and was also found to be significantly at par with the released check variety under experiment. While application of higher dose of fertilizer @ 90:45:45 NPK kg ha-1 resulted in excess vegetative growth and subsequent lodging and reduction in yield of the cultivars. However, the improved dwarf variety Sahbhagi dhan was recorded to perform better with higher dose of fertilizer i.e., 90:45:45 NPK kg ha-1 resulting in highest yield and highest benefit cost ratio. The highest production efficiency in terms of nutrient uptake was however recorded with cultivar Semvu shea. Hence, from the experimental findings it can be stated that with the application of correct dose of fertilizer cultivar Semvu shea of Phek district has the capability to perform as good as the released check variety whose yield was found to be significantly at par with the released variety.

References

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How to cite this article

T. Gohain and Sentirenla Changkija and Khrawbor Dkhar (2023). Effect of NPK Fertilizer Doses on Production and Productivity of Local Rice (Oryza sativa L.) Cultivars of Nagaland under Upland Rainfed Condition. Biological Forum – An International Journal, 15(10): 1562-1568.