| Abstrak/Abstract |
The impact of soil type on N fertilizer response is critical to fine-tuning N
recommendations. Soil N supply and fertilizer efficiency are critical
components affecting response to fertilizer N. Improved N management is
needed to optimize economic returns to farmers and minimize environmental
concerns associated with agricultural N use. Nitrogen losses through leaching
can contribute to elevated NO3 concentrations in groundwater. Concerns about
NO3 leaching are particularly relevant in areas with coarse-textured soils
receiving N fertilizer inputs for sugarcane. To minimize N losses, urea should
be coated by humic acid.
A glass house experiment was conducted in Laboratory of Soil and Land
Management, Department of Soil Science, University Gadjah Mada,
Yogyakarta. The aim of the current reasearch was to study the effect of humicurea fertilizer on the growth of sugarcane, to find the optimum rate of humicurea in producing the best N absorption for sugarcane thah planted in sandy
soil of Samas coast. The experiments were arranged in 3 x 5 factorial plus 1
control in a Completely Randomized Design (CRD) with three replications.
The first factor was three form of N fertilizer: ordinary prilled urea, prilled
humic-urea and tablet humic- urea), the second factor was five dosage of N
fertilizer (100%, (90%, 80%, 70%, and 60% of the N need (160 kg N.ha-1)
.
The present research showed that prilled humic-urea gave optimum result
in N uptake and N uptake efficiency of sugarcane on the lower rate N
application (98 kg/ha-1
) compare than ordinary urea (optimum result by
addition of N 128 kg.ha-1
). Prilled humic-urea fertilizer produced fertilization
efficiency until 33.38% in sandy soil of Samas coast |
