Ketersediaan Nitrogen pada Ultisol dengan Aplikasi Kotoran Walet dan Arang Kayu

Nur Indah Wulansari; Akhmad Rizalli Saidy; Bambang Joko Priatmadi

doi:10.20527/actasolum.v2i2.2438

Nur Indah Wulansari Program Studi Ilmu Tanah, Fakultas Pertanian, Universitas Lambung Mangkurat
Akhmad Rizalli Saidy Program Studi Doktor Ilmu Pertanian, Program Pascasarjana Universitas Lambung Mangkurat
Bambang Joko Priatmadi Universitas Lambung Mangkurat

DOI: https://doi.org/10.20527/actasolum.v2i2.2438

Keywords: Acidity, Ammonification, Nitrogen mineralization, Nitrification, Amino acid

Abstract

The application of organic matter with a high nitrogen (N) content in combination with the application of wood charcoal is a common soil fertility management practice in Ultisols. This study aims to determine the availability of N in Ultisols, which are applied to swallow droppings and wood charcoal. The experimental design used was a two-factor Completely Randomized Design (CRD), with the first factor being swallow droppings (0.5 and 10 t ha⁻¹) and the second factor being wood charcoal (0, 10, and 20 t ha⁻¹), with as many as three repetitions. As much as 200 g of soil was put into the incubation site, then swallow droppings and wood charcoal were added according to the treatment, stirred until evenly distributed, and then incubated at 70% field capacity for 14 days. The contents of NH₄⁺, NO₃^-, and pH were observed at the end of the incubation period. The results showed that the application of swallow droppings and wood charcoal increased the content of NH₄⁺, NO₃^-, and mineral N but lowered soil pH. The best treatment was given to swallow manure at 10 t ha^-1 which increased mineral N by 59%, and a combination of swallow manure 10 t ha^-1+10 t ha^-1 wood charcoal which increased nitrate content by 1,666%. The results of this study indicate that the application of swallow droppings combined with wood charcoal can increase the availability of N in Ultisols.

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