Abstract
Bumi Nabung district consists of 6 villages with a total area of 7,810 ha which are divided into 251 ha of rain fed rice lands, 4,908 ha of dry land, 1,317 ha of lowland, 1,158 ha of yards and 176 ha of others. Rumbia district consists of 14 villages which has a total area of 22,696 ha of land consisting of 2,728 ha of yards, 17,358 ha of dry land, 326 rainfed paddy field, 839 ha of swamp land, 1,470 ha of lowland and 4,232 ha of others. Bumi Nabung and Rumbia districts have a low soil fertility potential that is reflected by the lowof soil pH, CEC, total N, available P, and high level of exchangeable Al and Al saturation. The results assessment based on the physical and chemical characteristics showed that Bumi Nabung district have 5 villages on suitable class S-2 (North Bumi Nabung, East Bumi Nabung, Bumi Nabung Ilir, South Bumi Nabung, and Sri Kencono) and one village New Bumi Nabung has less suitable class S-3. In the Rumbia District, there were 14 villages belonged to suitable class (S-2), namely Reno Basuki, Rekso Binangun, Teluk Dalam Ilir, Rukti Basuki, Restu Baru, Restu Buana, Bina Karya Buana, Bina Karya Putra, Bina Karya Jaya, Bina Karya Utama, Bina Karya Sakti, Joharan, Rantau Jaya Ilir and Rantau Jaya Baru. Bumi Nabung and Rumbia districts have the potential fertility and land suitability for extensification and development of soybean crops. The main technology components to support this program are the use of ameliorant (dolomite and zeolite), the application of organic fertilizers (manure and compost) and inorganic fertilizers (NPK).Keywords: Acid soil, central Lampung, land suitability, soil fertility, soybeans
Highlights
Potato (Solanum tuberosum L.) is one of the most important food crops in the world, which is rich in essential minerals providing both biological and nutritional values to human beings (Ekin 2011)
The results of the analysis of variance showed that no significant difference on the potato tuber moisture contents among the treatments of organic matter and mycorrhiza (Table 3)
The treatments showed similar effects on ash contents of potato tubers (Table 2). Both compost and biochar resulted in the same ash contents of potato tubers
Summary
Potato (Solanum tuberosum L.) is one of the most important food crops in the world, which is rich in essential minerals providing both biological and nutritional values to human beings (Ekin 2011). Potato demands high level of soil nutrients for its tuber production due to relatively poor developed. There is a high demand for chemical-free foods (El-Sayed et al 2014). One of the solutions to reduce the use of chemicals in agriculture is by using biofertilizers contained of living microorganisms which have the ability to mobilize nutrients in soil from unavailable to available forms through biological processes. Application of biofertilizers to soil allows the microorganisms to colonize the rhizosphere together with the plants and increase the supply or availability of nutrients to the host plants (Vessey 2003) as well as increase the soil fertility and crop production in sustainable farming (Wu et al 2004, AL-Zabee and AL-Maliki 2019)
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