Investigation of C-Organic Content, Nitrogen, Phosphorus, Potassium Nutrients, pH Soil and C/N Ratio of Tidal Rice Fields in Sidomulyo Village, Anggana District, Kutai Kertanegara Regency, East Kalimantan

Abstract

The purpose of this study was to investigate the content of organic C, Nitrogen, Phosphorus, Potassium nutrients, pH soil and C/N ratio in tidal paddy fields in Sidomulyo Village, Anggana District, Kutai Kertanegara Regency, East Kalimantan; use for productivity sustainability conservation; and identify the current fertility condition of the land and for sustainable management actions. The research was carried out by taking 5 soil samples for each specified tidal field, using a soil drill with a depth of ±30 cm, taking 1 kg each in a composite manner and chemically analyzing at the Soil Science Laboratory, Faculty of Agriculture, Mulawarman University. The results of laboratory analysis provide information that: pH soil parameter, all samples showed very acidic with an average acidity number of 4.28 (lowest 2.13, highest 3.88), two categories of C-organic content parameters identified, namely the moderate category of 4 samples, (ie: 2.13 %, 2.71%, 2.91%, and 2.93%); and high category, totaling 6 samples (ie: 3.23%, 3.27%, 3.30%, 3.36%, 3.45%, and 3.88%); Total Nitrogen content parameters were also identified in the medium category, totaling 7 samples (0.27%, 0.35%, 0.38%, 0.39%, 0.48%, 0.48% and 0.48%); high category, totaling 3 samples (0.31%, 0.34%, 0.58%); parameter of C/N ratio, all 10 samples showed low category; Parameter of Phosphorus available shows variation, in the low category there is 1 sample (ie 6.73 ppm), the medium category is 1 sample (10.18 ppm), the high category, there are 2 samples (ie 14.27 ppm and 14.82 ppm), very high category, as many as 6 samples (18.36 ppm, 23.27 ppm, 17.64 ppm, 32.36 ppm, 17.45 ppm, and 15.64 ppm), Parameter of Potassium available, all samples show a very high category.