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All Journal Indonesian Journal of Agricultural Science Buletin Iptek Tanaman Pangan
Eman Paturohman
Pusat Penelitian dan Pengambangan Tanaman Pangan Jl. Merdeka 147 Bogor 16111
Agriculture, Biological Sciences & Forestry Computer Science & IT

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GENETIC VARIABILITY, HERITABILITY AND EXPECTED GENETIC ADVANCES OF QUANTITATIVE CHARACTERS IN F2 PROGENIES OF SOYBEAN CROSSES Hakim, Lukman; Suyamto, Suyamto; Paturohman, Eman
Indonesian Journal of Agricultural Science Vol 15, No 1 (2014): April 2014
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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The F2 progenies of crosses among three soybean varieties were evaluated with their parents at Ngale Experimental Farm, Ngawi, East Java during the dry season of 2011. The experi-ment was conducted in a randomized block design with three replications. The seeds of each F2 progenies and parents were planted in two rows of 4.5 m long. Plant spacing was 40 cm x 15 cm and each hill contained one plant. Among the characters studied, seed weight per plant, number of pods per plant and days to maturity had the highest coefficient of variability with the means of 52.6%, 48.2% and 41.9%, respectively. Whereas seed size, plant height and number of reproductive nodes had moderate values of 36.9%, 35.5% and 37.4%, respectively. Number of branches and days to flowering had the lowest variability of 11.7% and 15.3%, respectively. Number of pods per plant, days to maturity, plant height and seed size had high mean estimates of heritability coupled with high genetic advance. The genetic progress of these characters that would be obtained for one generation of selection was estimated 47.2%, 45.7%, 40.9% and 40.3%, respectively. Among the agronomic characters, plant height, number of pods per plant, seed size and days to maturity had the highest coefficient of variability associated with high heritability and genetic advance. Therefore, selection for high yielding with early maturity soybean genotypes based on plant height, number of pods per plant and seed size might be possible.
Pemupukan sebagai Penentu Produktivitas Ubi Jalar Paturohman, Eman; Sumarno, Sumarno
Buletin Iptek Tanaman Pangan Vol 10, No 2 (2015): Desember 2015
Publisher : Puslitbang Tanaman Pangan

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Sweet potato (Ipomoea batatas L.) is a cosmopolitan crop, grown on 116 countries in the world. A total of 34 countries harvested 200,000 tons or more fresh tuber annually, and 82 countries with a national production less than 200,000 tons per year. China accounted for 68% of the world’s sweet potato production or 90% of the Asian fresh tuber production. The sweet potato productivity varies among countries in the world, from less than 5 t/ha to 24 t/ha, mainly related to the amount use of inorganic fertilizers of N, K, and organic fertilizer. The recommended use of fertilizers for sweet potato is as follow: low to moderate dosage of N (40 to 75 kg N/ha), low dossage of P (20-50 kg P2O5 /ha), and medium to high dosage of K (75-100 kg K2O/ha), combined with organic manure (3-10 t/ha). Indonesian sweet potato productivity is relatively high as compared to that in other countries in the world with an average of 14.75 t/ha. In the provincial production center, sweet potato productivity ranges from 18 to 22.7 t/ha fresh tuber except in Nusa Tenggara Timur (7.5 t/ha) and Papua (10.9 t/ha). In other provinces, the productivities range from 7.1 to 15.5 t/ha fresh tubers. Commercial sweet potato farming is always carried out under an optimum agroecology condition; however farmers do not always obtain optimum yield due to inoptimum application of fertilizer. Application of the recommended dosage of inorganic fertilizers with the addition of 3 to 5 t/ha organic manure is expected to improve sweet potato productivity to 24-25 t/ha fresh tubers. Improvement on sweet potato productivity will increase the supply of fresh tubers to the markets and thus, increases the sweet potato consumption as a rice substitute.
Co-Authors Lukman Hakim Sumarno . Suyamto Suyamto