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
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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 50 soil samples from 10 determined tidal fields, each 5 samples per field, made into 1 kg of soil in a composite manner, so that 10 soil samples were obtained. Soil samples were taken using a soil drill with a depth of ±30 cm. The composite sample was analyzed at the Laboratory of Soil Science, 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, totalling 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. Keywords: Investigation, C-organic, C/N ratio, pH soil, Tidal rice field.
- A - Agriculture