Abstract
The research was intended to identify amounts of fertilizers applied by small-scale farmers related to rice yield cultivated on marginal peat soils in irrigated paddy fields in Bengkulu. The study was conducted at two peat areas; Pekik Nyaring Village, Air Hitam irrigated rice fields in Central Bengkulu and Sumber Makmur Village, Air Manjuto irrigated areas, Mukomuko Bengkulu Province from June to September 2020. A combination of purposive, snowballing samples was used to find 65 farmers as key informants. Collected data and information about fertilizers applied by farmers for paddy cultivation. Multiple regression analysis was used to find cumulative and partial contribution and significance effect of the fertilizers applied to rice yields. The result showed that fertilizers applied by the farmers significantly increase rice yield but the fertilizers played not great portion and urea fertilizer gave the highest contribution. Rice yield harvested by farmers was lower compare to the average rice productivity in Bengkulu because the doses of fertilizers applied were lower than the recommend dose. Rice yield can be improved through increasing the fertilizers dose. Optimum dose of fertilizers applied should be 567 kg Urea ha-1, 323 kg SP-36 ha-1, 790 kg ha-1 or 912 kg NPK ha-1. High soil porosity and lateral water conductivity however may cause inefficiency of fertilizers applied in marginal peat soils because soluble nutrients in peat solution carried out the fertilizers from root zone by water flow.
Highlights
Rice is a strategic commodity in Indonesia (Mariyono, 2014) due to the status as the main staple food (Aprillya et al, 2019a)
This study was aimed to determine significant effect of N, P, K, NPK compound fertilizers and dolomite applied by small-scale farmers and optimum level of them to rice yield cultivated on marginal peat soils at two irrigated rice field in Bengkulu Indonesia
A case study was to evaluate N, P, K, NPK compound fertilizers and dolomite applied by smallscale farmers related to rice yields cultivated on marginal peat soils at 2 irrigated peat rice fields in Bengkulu; Sumber Makmur village, Air Manjuto irrigated area in Mukomuko Regency and Pekik Nyaring Village, Air Hitam irrigated area in Central Bengkulu Regency, Bengkulu Province (Fig. 1) conducted from June to September 2020
Summary
Rice is a strategic commodity in Indonesia (Mariyono, 2014) due to the status as the main staple food (Aprillya et al, 2019a). Rice production in Indonesia is insufficient to meet population needs (Mustikarini and Santi, 2020). In 2019, rice production in Indonesia was about 54.6 M tons harvested from rice fields of 10.67 Mha (BPS-Statistics Indonesia, 2020). Since 2000, Indonesia has begun importing rice which reached its peak in 2018 with a total import of 2.14 M tons. If Indonesia does not want to depend on rice imports, paddy production must continue to be increased (Aprillya et al, 2019b). Indonesian government had targeted of rice selfsufficiency and to become the world’s food basket by
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