Soil fertility management of rainfed rice fields in Bengkulu Province, Indonesia

Nurmegawati Nurmegawati,Yartiwi Yartiwi,Irma Calista,Yulie Oktavia,Ahmad Damiri,Tri Wahyuni,Wilda Mika Sari,Yahumri Yahumri,Yudi Sastro,Rubiyo Rubiyo,C Indrawanto

doi:10.1051/e3sconf/202130604025

Abstract

Rice is a staple food for the Indonesian people and is a national strategic commodity for national food security. Rainfed area is a potential land to support national rice production, by improving soil management through balanced fertilization based on the soil characteristics. This study aims to determine the soil fertility and alternative management implemented in 2019 and 2020 in Sukaraja and Pondok Kelapa sub districts, Bengkulu Province. Soil fertility status for CEC, base saturation, C-organic, total P and total K taken based on the classification of the value of the combination of these chemical properties. The results showed that the soil fertility status of the rainfed rice fields in Sukaraja and Pondok Kelapa sub districts was low. The limiting factors for soil fertility for Sukaraja sub district are alkaline saturation, total K-total and P-total for Pondok Kelapa sub district. The limiting factors are all elements related to nutrient status assessment, namely CEC, base saturation, total P, total K and C-organic. Alternative soil management is carried out in an integrated manner by providing balanced organic and inorganic fertilizers. The provision of soil amendments such as straw compost, manure, biochar and agricultural lime/dolomite, especially for acid reacting soils, aims at increasing soil fertility before fertilization is applied.

Highlights

Population growth from year to year continues to increase
The population of Indonesia in 2020 reaches 269.6 million people [1] and this followed by an increase in food needs
Rainfed land commonly use for rice cultivation at least once a year, depends on rainfall [3]

Summary

Introduction

Population growth from year to year continues to increase. The population of Indonesia in 2020 reaches 269.6 million people [1] and this followed by an increase in food needs. The area of irrigated paddy fields continues to decrease due to the land use conversion of paddy fields to non-agricultural use. Indonesia government has policy to expand rice growing areas by optimizing suboptimal land use, such as swamp land, upland, as well as rainfed land. The area of rainfed rice fields in Indonesia is about 4 million ha [4], 3.71 million hectares (45.7% of the total paddy field), spread over Java, Nusa Tenggara, Sumatra, Kalimantan, and Sulawesi and about 33.4% of rainfed paddy fields can be planted twice [5]

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Conclusion