Coconut plantations with new system of planting distance allow wider use of distance under the coconut than the conventional planting distance. Evaluation stability ofMapanget coconut (DMT) and KHINA hybrid coconut at various planting distance systems can be used as a recommendation for the development of coconuts with new planting distance in the most suitable environmental conditions. The purpose of this study was to determine the stability of the yields of DMT and KHINA grown with various distance models for five years observation. The experiment was arranged in a factorial experiment design consistsof 8 treatments with 2 replications, in the Mapanget Experimental Garden, North Minahasa Regency, North Sulawesi Province, for 5 years from 2014 to 2018. The results showed that the combined analysis variance was significantly different (F < 0.05) both GXE interaction for the number of fruits, while the character number of bunches is not different. The results of AMMI Biplot showed that Khina coconut with the most stable distance of 9 x 9 m followed by Khina coconut with a distance of 5x16 for land use under coconut plants with intercropping suggested using a distance of 5x16 m.

Peatlands is a very specific ecosystem with conditions that are always flooded, fragile, relatively infertile, able to absorb more water, and bad aeration. Riau has the largest peat land, which is 64% of the total peatlands area in Sumatra, but the development of shallot has not been intensively cultivated. So it must be dealt with seriously. The use of compost fertilizer and the frequency of NPK apply can improve the nature of these peatlands and increase crop production. The aim of study was to determine the interaction effect and the main application of compost and the frequency of NPK apply to increasing shallot production on peat soil. Research conducted at the Faculty of Agriculture Experimental Farm, Riau Islamic University during 6 month, i.e. form March - August 2018. Factorial Completely Randomized Research design, the first factor was 10, 20 and 30 tons/ha of corn compost, the second factor was NPK 16:16:16 fertilization frequency 1 and 2 fertilizing doses of 150, 300 and 450 kg/ha. Parameters observed were peat analysis, tuber number, tuber diameter, wet tuber weight per clump, dry tuber weight per clump and percentage of tuber shrinkage. The results showed that the interaction and main effects were significant for all observed parameters with the best treatment of compost is 30 tons/ha and 2 times the fertilizer dose of 150 kg/ha per application (300 kg/ha). Keywords: Shallot, Frequency, Compost, Fertilization, NPK, Production

Abstract. Nur MSM, Arsa IGBA, Malaipada Y. 2019. The effect of cattle manure and mineral fertilizers on soil chemical properties and tuber yield of purple-fleshed sweet potato in the dryland region of East Nusa Tenggara, Indonesia. Trop Drylands 3: 56-59. A field experiment was carried out to study the effect of combination of cattle manure and mineral fertilizer on the soil chemical properties and yield of purple-fleshed sweet potato in the Integrated Field Laboratory of Archipelagic Dryland Center of Excellence, Universitas Nusa Cendana during November 2017 to March 2018. The experiment was arranged in a Randomized Block Design, with six treatments and four replicates. The assigned treatments were P0 = without manure and without mineral fertilizer, P1 = 100% recommended dosage of manure (20 tons ha-1), P2 = 75% recommended dosage of manure (15 tons ha-1) + 25% recommended dosage of mineral fertilizer (25 kg urea ha-1, 25 kg SP-36 ha-1 and 37.5 kg KCl ha-1), P3 = 50% recommended dosage of manure (10 tons ha-1) + 50% recommended dosage of mineral fertilizer (50 kg urea ha-1, 50 kg SP-36 ha-1 and 75 kg KCl ha-1), P4 = 25% recommended dosage of manure (5 tons ha-1) + 75% recommended dosage of mineral fertilizer (75 kg urea ha-1, 75 kg SP-36 ha-1 and 112.5 kg KCl ha-1), and P5 = 100% recommended dosage of mineral fertilizer (100 kg urea ha-1, 100 kg SP-36 ha-1, 150 kg KCl ha-1). The results showed that P1 and P2 treatments produced the highest contents of organic-C, total-N, available-P, exchangeable-K and soil Cation Exchange Capacity. However, the highest tuber weight was obtained in the treatment P3. These results indicated that the combination of 50% recommended manure dosage (10 tons ha-1) + 50% recommended mineral fertilizer dosage (50 kg urea ha-1, 50 kg SP-36 ha-1 and 75 kg KCl ha-1) could provide a balanced nutrient content in sufficient quantities that meet the sweet potato requirements from the early growth stage to the tuber formation stage, and create soil physical conditions that support the sweet potato tuber development.

ABSTRACT The purpose of this study was to investigate the interaction of the application of AB Mix nutrition and growing media on the growth and production of Shallots (Allium ascalonicum L.) on  NFT hydroponics. This study uses a ]Compound Plot Design in the form of a Completely Randomized Design consisting of the main plot, namely the nutrient concentration of AB Mix (N) and subplots of planting media (M). Nutrition AB Mix consists of 4 treatment levels, 600, 1200, 1800, 2400 ppm / l water and various planting media treatments consisting of 3 levels, namely husk, cocopeat, and sawdust charcoal media. Each experimental unit consisted of 4 plants and 2 plants used as samples. The parameters observed were as follows: plant height, harvest age, number of tubers, wet tuber weight, dry tuber weight, tuber weight per tuber, tuber weight loss. The observations of each treatment were statistically analyzed and continued with further tests of Honest Significant Difference at the 5% level. The interaction of the application of AB Mix nutrition and planting media had a real effect on all parameters, with the best AB Mix 1800 ppm and cocopeat growing media. The effect of AB Mix main plot has significantly affected all parameters observed with the best treatment of AB Mix 1800 ppm nutrition. The effect of subplot planting media significantly affected all parameters of observation with the best treatment of cocopeat growing media Keywords: AB Mix, Shallots, NFT hydroponics

Riau is a province in Sumatra Island with the widest peatland covering up to ± 4,04 million Ha or about 56,1% of the area, with various type of peat, including the potentially submerged peat area.  With the peat charasteristics drawbacks such as low nutrient content and relatively high acidity, cause this type of land  barely cultivated for horticulture crop such as shallot. Whilst, in Indonesia, shallot is part of daily society culinary component. Therefore, efforts are needed to make use of peat land for this type of commodity by overcoming the shortages, for example by applying Trichocompost combined with Grand-K fertilizer. This research thus aimed at evaluating the growth and yield of shallot in potentially submerged peat soil, treated with Trichocompost and Grand-K Fertilizer. Experiment was conducted on peat soil   in Labersa Street Kelurahan Simpang tiga Kecamatan Bukit Raya Kota Pekanbaru for three months, from October to December 2019. The experiment was arranged in completely factorial design with two factors; each at four levels. The factors were Trichocompost (at 0, 2, 4, 6 ton ha-1) and Grand K fertilizer (at  0, 50, 100, 150 kg ha-1). The parameters observed were the percentage of seed viability, plant height, number of leaf, number of tuber, and the yield per plan. Results of the experiment showed that the best combination of treatment was Trichokompos at 4 – 6 ton ha-1 dan Grand K at 150 kg ha-1.