Shallots are strategic horticultural commodities, and climatic conditions strongly influence their growth. In certain seasons, a decline in production is unavoidable, causing price increases at a consumer level and eventually contributing to the rate of inflation. The application of Good Agriculture Practices (GAP) is a strategy that can maintain and increase the productivity of shallots. This study aimed to determine the effect of applying GAP on the growth and yield of shallots in several varieties developed in North Maluku. The research was carried out in Trans Koli SP-1 Village, Oba District, Tidore Islands City, from March – June 2015. The study was arranged in a factorial, the first factor was cultivation habits (GAP and farmer habits), and the second factor was varieties (Topo-1, Topo-2, Super Philips, and Thailand), which used a Randomized Block Design with three replications. Parameters observed were plant growth, the intensity of pests and diseases, yield components and the production of shallot bulbs. The results showed no interaction between cultivation habits and varieties in all parameters, but there were significant differences between the research cultivation habits and varieties in all parameters. The Super Philips variety generally had significantly higher growth and lower intensity of armyworms than the Topo-1, Topo-2, and Thailand varieties. In terms of yield and tuber production, Super Philips and Thailand varieties have significantly higher yields than Topo-1 and Topo-2. The results of this study confirmed that the application of GAP had a better effect on growth, pest intensity, and production of shallots than farmers' habits.
Dry land with low fertility causes low productivity. Ameliorant of rice husk charcoal (RHC) has potential to improve soil properties and increasing rice productivity. This study investigates the RHC effect on soil properties, rice growth and yield in the dry land. The experimental research was held in Gunungkidul, with randomized complete block design consists of 6 treatments and 3 replications. The treatment was dose of RHC, consisting of without RHC (Control), RHC at dose of 1 ton ha−1 (RHC1), 2 ton ha−1 (RHC2), 3 ton ha−1 (RHC3), 4 ton ha−1 (RHC4), and 5 ton ha−1 (RHC5). The results showed that giving RHC increased soil pH to 6.43 and decreased soil Eh to 54 mV. RHC at a dose of 3 ton ha−1 (RHC3) was chosen as alternative, producing dry grain by 4.94 ton ha−1, dry straw by 6.31 ton ha−1, carbon absorption in grain by 2.65 ton ha−1 and straw by 2.92 ton ha−1, and reduces the percentage of empty grain up to 5.38%. Ameliorant of RHC improves soil properties, better growth, increasing rice productivity, better grain quality, and maintains environmental quality through carbon absorption.
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