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International Journal of Agricultural Research
  Year: 2016 | Volume: 11 | Issue: 1 | Page No.: 32-39
DOI: 10.3923/ijar.2016.32.39
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Effect of Fertilizer Application and Plant Density on Physiological Aspect and Yield of Taro (Colocasia esculenta (L.) Schott var. Antiquorum)
N.E. Suminarti, Ariffin , B. Guritno and M.L. Rayes

A research was conducted to study the effect of nitrogen and potassium (NK) fertilizers and plant density on the growth and yield of taro (Colocasia esculenta (L.) Schott var. Antiquorum). The field experiment was carried out at Brawijaya University experimental field station located at Jatikerto, Malang, Indonesia. The experimental treatments consist of three plant density (18,000, 24,000 and 30,000 ha–1) and three levels of NK fertilizer (62.50 kg N, 81 kg K2O, 125 kg N, 162 kg K2O, 187.50 kg N, 243 kg K2O ha–1). These treatments were arranged in a split plot design; fertilizer in the subplot and plant density in the main plot with three replications. The F-value (p = 0.05) was used to test the treatment effect and Least Significant Different (LSD) (p = 0.05) was used to test the difference between treatments. The results showed that there was no interaction between NK fertilization and plant density for most of the parameters. Plant density only significantly influenced the number of tubers per plant and starch content. The optimum application rate of NK fertilizers was obtained as 127.04 kg N ha–1 and 164.64 kg K2O ha–1 with the tuber yield of 16.72 t ha–1. The highest starch content (28.36%) achieved at the application rate of 127.84 kg N ha–1 and 162.08 kg K2O ha–1.
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How to cite this article:

N.E. Suminarti, Ariffin , B. Guritno and M.L. Rayes, 2016. Effect of Fertilizer Application and Plant Density on Physiological Aspect and Yield of Taro (Colocasia esculenta (L.) Schott var. Antiquorum). International Journal of Agricultural Research, 11: 32-39.

DOI: 10.3923/ijar.2016.32.39


16 December, 2015
Yusuf Hassan-Maiwa:
This paper failed to categorically and explicitly state the reason for the NK fertilizer trial, in terms of what it aimed to achieve which the other NPK trial failed to achieve.
It also failed to reveal the P status of the soil prior to the study. How can you conduct a soil analysis without P; CEC values?
The methodology was faulty in applying K fertilizer in split form. K is not a mobile nutrient in particularly acidic medium, and is applied full dose during land preparation or planting, but never in split form. There is the tendency it was not available to the plant both in time and space, hence the negative result obtained, because it was fixed.
The abstract should have reported the second fertilizer level as the optimum, since it was the treatment level used, and not the value they reported, which is not significantly different from the 2nd treatment level in the study. They would however report that other value found, in the text.
Finally, the year, season and perhaps specific dates for the study should have been given.






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