Abstract                 Volume:7  Issue-10  Year-2020          Original Research Articles

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Effect of reduced nitrogen fertilizer rate on nitrogen uptake and yield of spinach (Amaranthus spp.)
Faridah Manaf1*, Roslan Ismail2 and Arina Shairah Abdul Sukor2
1Malaysian Agricultural Research and Development Institute (MARDI), 43400 Serdang, Selangor, Malaysia
2Faculty of Agriculture, University Putra Malaysia, 43400 Serdang, Selangor, Malaysia
*Corresponding author

Reducing nitrogen (N) fertilizer rate have beneficial effect on N uptake by plants. Studies on reducing N rate in sweet potato and beetroot to improve their growth and yield are well documented but the effect of decreased N rate on N uptake by leafy vegetables are limited. A glasshouse experiment was conducted to determine the effect of different N rate on N uptake of green spinach. Treatments evaluated were (i) soil alone, and (ii) different N fertilizer rate (12, 24, 36, 60, 90 and 120 kg N/ha). Treatments were applied at 14 days after seeding (DAS) at a uniform rate of 2 t/ha. Results revealed that moderate N input between 12 to 36 kg N/ha improved N uptake and yield of spinach compared with lower rate of N input (0 to 12 kg N/ha) but higher N level of 90 kg N/ha was most effective in improving N uptake and fresh yield. The effectiveness of N input at 90 kg N/ha corresponded to the optimum retention of soil N resulting in timely availability of N for uptake by spinach leading to higher yield. Although treatment with excess N (120 kg N/ha) improved N uptake, the decline in yield was because of soil nutrient imbalance that inhibited other nutrients required by plants for growth and development. The findings from the study suggest that reducing N fertilizer rate improves N uptake in leafy vegetables without reducing productivity depending on their specific N requirement.

Keywords: Fertilizer Leafy vegetable Nitrogen Nutrient management Soil fertility
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How to cite this article:

Faridah, M., Roslan, I., Arina, A. S., 2020. Effect of reduced nitrogen fertilizer rate on nitrogen uptake and yield of spinach (Amaranthus spp.).Int.J.Curr.Res.Biosci.Plantbiol. 7(10): 1-7. doi: https://doi.org/10.20546/ijcrbp.2020.710.001