Environmental factors, especially climate, soil and pest attack, are limiting factors in citrus production. The purpose of this study was to determine the limiting factors on RGL citrus productivity. This research was carried out in 2019 in Pal VII Village, Bermani Ulu Raya District, Rejang Lebong Regency, Bengkulu Province with seven farmers at the research location. Data was collected from primary and secondary data consist of 10 years climate data, soil characteristics and citrus pest and diseases identification, which are then analyzed descriptively. The results showed that the productivity of RGL citrus in the research location was influenced by high rainfall during the fruiting period. Another limiting factor is the relatively low soil nutrient content because farmers generally do not apply fertilization technology that based on crop needs. Pests and diseases that had been potential reduced the productivity and quality of citrus fruits were fruit borers, fruit flies and scurvy, and climate factors also influenced the quality.
The problem with dry land is that it has a low fertility rate which causes low land productivity, so that production is low. This study aims to determine the suitability of upland rice land and soil fertility status in 3 sub-districts, namely Air Periukan, Pondok Kelapa, and Kerkap. The parameters observed were land characteristics which included climate data and soil physical and chemical properties. Data analysis was carried out by matching each land characteristic with the conditions for upland rice growth. The conclusion was based on the smallest value (minimum law) as a land suitability decision. The results showed that the suitability of the upland rice field in Air Periukan District, Pondok Kelapa district, and Kerkap district are included in S3 classes. Furthermore, the limiting factors for those districts are different. In the Air Periukan District, water availability and nutrient retention as limiting factors. However, only water availability is a limiting factor in Pondok Kelapa district. The land suitability in the Kerkap district for upland rice land has a limiting factor regarding nutrient retention and nutrient availability. The suggested alternative for soil cultivation in the research area is increasing C-organic and CEC, improving other nutrient content by providing manure, straw compost, and giving balanced inorganic fertilizers.
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