EFEK RESIDU PEMUPUKAN NPK BERBASIS AMONIUM DAN NITRAT TERHADAP KETERSEDIAAN HARA, KELIMPAHAN BAKTERI SERTA PERTUMBUHAN DAN HASIL TANAMAN SAWI
NPK fertilizer residue can positively affect the improvement of soil nutrients and increase crop production, but the negative impact to the soil and plant growth can also be caused by fertilizer unmanaged NPK fertilizer. The aim of this study was to determine the residual effect of NPK fertilizer based combination of ammonium nitrate and NPK petrobiofertile on availability of nutrients in the second cropping season. Treatment tested were residue of 400 kg ha-1 of NPK 25-7-7 with additional nitrate as much as 1%, 2% and 3% and fertilizer combinations Petrobiofertil 100 kg ha-1. Results showed that the treatments significantly affected the content of mineral N at 20 days after planting at a depth of 0-20 cm and at 40 days after planting at 0-20 cm and 20-40 cm depths, Â but the results were not significant at a depth of 20-40 cm at 20 days after planting. N concentration at 40 days after planting at a depth of 0-20 cm was significantly different high at P4 treatment. Concentrations of total K was significant at 20 days after planting at a depth of 0-20 cm and 20-40 cm and at 40 days after planting at 20-40 cm depth. The treatments also results in a significant number of bacterial colonies on 20 days after planting and 40 days after planting. Plant height, leaf number, leaf area, fresh consumption significant weight at 20 until 40 days after planting. N uptake was also significant at 20 and 40 days after planting
APPI (Asosiasi Produsen Pupuk Indonesia). 2009. Kebutuhan Pupuk NPK di Indonesia tahun 2006-2015. http://www.appi.or.id/statistic (online) diakses Juli 2015.
Handayanto, E. dan Hairiah, K. 2007. Biologi Tanah: Landasan Pengelolaan Tanah Sehat. Pustaka Adipura. Yogyakarta.
Kong, H.M., He, Y.Q., Wu, D.F. and Li, C.L. 2004. Effect of long-term fertilization on crop yield and soil fertility of upland red soil. Chinese Journal of Applied Ecology 15, 782-786.
Liu, C.W., Sung, Y., Chen, B,C. and Lai, H.Y. 2014. Effect o Nitrogen Fertilizers on the Growth and Nitrate Content of Lettuce (Lactucia sativa L.) International Journal of Environment Research and Public Health 11, 4427-4440.
Lu, M., Yang, Y., Luo, Y., Fang, C., Zhou, X., Chen, J., Yang, X. and Li, B., 2011. Responses of ecosystem nitrogen cycle to nitrogen addition a meta-analysis. New Phytologist 189, 40-50.
Manan M C, Swarup A, Wanjari R H, Ravankar H N, Mishra B, Saha M N, Singh YV, Sahi D K, Sarap P A. 2005. Long-term effect of fertilizer and manure application on soil organic carbon storage, soil quality and yield sustainability under sub-humid and semi-arid tropical India. Filed Crops Research (93): 264-280.
Robertson, G.P., Vitousek, P.M., 2009. Nitrogen in agriculture: balancing the cost of an essential resource. Annual Review of Environment and Resources (34): 97-125
Stamatiadis S, Werner M, Buchanan M. 1999. Field assessment of soil quality as affected by compost and fertilizer application in a broccoli field (San Benito County, California). Applied Soil Ecology (12): 271-225
Treseder, K.K., 2008. Nitrogen additions and microbial biomass: a meta-analysis of ecosystem studies. Ecology Letters (11): 1111-1120
Zhang, J., J. Qin., W. Yao., L. Bi., TT. Lai., X. Yu. 2009. Effect of long â€“term application of manure and mineral fertilizers on nitrogen mineralization and microbial biomass paddy soil during rice growth stages. Plant Soil Environment 55 (3): 101-109.
How to Cite
The copyright of the received article shall be assigned to the journal as the publisher of the journal. The intended copyright includes the right to publish the article in various forms (including reprints). The journal maintains the publishing rights to the published articles.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.