Abstract
This study aims to find out the accuracy of PlanetScope imagery in analyzing the total content of Nitrogen (N), Phosphorus (P), Potassium (K) and Sulfur (S) in terrace paddy field. The area for this research is terraced paddy fields in Wonosari Sub-district, Gondangrejo District, Karanganyar Regency, Central Java Province, Indonesia. Aerial photo analysis from PlanetScope (www.planet.com) was conducted at the Pedology Laboratory and Soil Survey, while soil sample analysis was carried out at the Laboratory of Chemistry and Soil Fertility, Faculty of Agriculture, Sebelas Maret University (UNS). The preparation aerial photo analysis from PlanetScope was carried out in September 2019. Soil sampling, laboratory analysis, and data analysis were carried out from September 2019 to January 2020. There are 3 Citra PlanetScope bands that have a significant effect on the elements being studied. Those three bands are band 1 (red), band 3 (blue) and band 4 (NIR). Multiple linear regression analysis obtained a regression equation model from those three bands. This model can be used as an estimator for the existence of the soil nutrient being studied. The accuracy values obtained for N, P, K and S in terraced paddy fields are 97.58%; 94.85%; 85.97%; and 97.39% and the R2 value of 0.39; 0.30; 0.30 and 0.27. The R2 value, which is still relatively small, indicates that there are many factors may affect the accuracy value.
 Int. J. Agril. Res. Innov. Tech. 11(1): 1-9, June 2021
Highlights
Soil fertility is an important thing that has to be noticed in agriculture
This research will discuss about terraced rice fields, which it is assumed that the distribution of soil fertility not evenly distributed
This case causes inefficient fertilization given to terraced paddy fields
Summary
Soil fertility is an important thing that has to be noticed in agriculture. The success of cultivating a plant is determined by soil fertility. Soil become an important factor, besides being a support for the soil plant body, it is used as a nutrients provider for both macro and micronutrients. Macro nutrient content must more than 0.02% and if it is less it, it is called micronutrient. This research will discuss about terraced rice fields, which it is assumed that the distribution of soil fertility not evenly distributed. This case causes inefficient fertilization given to terraced paddy fields. In a research conducted by Kaya (2019) the higher the dose of N, P, K fertilizers given, it can significantly increase the height of rice plants and it can increase the number productive tillers or clumps of rice
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