The research aimed to study whether soil pH affects exogenous application of amino acid tryptophan and IAA in increasing root nodules and soybean yield. The experiment was conducted in greenhouse using 20 cm diameter plastic pot filled with fine soil, arranged in completely randomized design (CRD) with four treatments. Each treatment combination was repeated three times. Three seeds of local soybean variety were planted into each pot then to remain one plant a week after planting. Variables observed were root nodules number, shoot dry weight and seed yield. Plant nutrients were supplied in the form of solution to meet crop needs. The data obtained were analyzed statistically by F test at 5% of level confidence, followed by Duncan's multiple range test when there was a significant effect. The results showed that both exogenous amino acid tryptophan and IAA increased number of root nodules, shoot and root dry weight and soybean yield. Higher root nodules number was taken from the treatment combination of 0.001 ppm IAA applied at V 3 in Alfisol and Vertisols, and 1.0 ppm on Entisols. However, the highest soybean yields were taken from the treatment combination of 1.0 ppm tryptophan applied at V 0 in Alfisols (6.51 g plant -1).
<p>Desease that often occurs on the shallot is moler caused by Fusarium oxysporum f. sp. cepae (FOCe). This research was conducted to studied the potential of root-colonizing fungi to suppres moler disease on shallot. The researchs were divided into two steps that were laboratory test and screen house test used Completely Randomized Design (CRD). The treatments in screen house test were the combination of four fungi that had best capability to inhibit growth of FOCe. Each treatment was repeated three times. The result showed that root-colonizing fungi could reduce the moler disease but haven’t affect significantly growth component of shallot. Lowest disease intensity was 20% on the combination of AJ01, AJ12, AJ17, AJ18. Root-colonizing fungi have potention to decrease Moler disease.</p>
<p>Kelud volcanic ash has high source of minerals, which is potassium. This study aims to determine the effect and find the best composition of Kelud volcanic ash and manure to the availability and corn uptake of potassium in the Alfisols.This research is expected to provide information on the composition of volcanic ash Kelud and proper manure for agriculture. This research was conducted in the greenhouse, in the Laboratory of Ecology and Management of Crop Production, and soil chemistry laboratory of the Faculty of Agriculture, Sebelas Maret University in June 2014 - January 2015. Research using completely randomized design which consists of two factors, there are the thickness of Kelud volcanic ash which consists of four levels A0 (0 cm), A1 (2 cm), A2 (4 cm), and A3 (6 cm) and the dose of manure were P0 (0 ton/ha), P1 (2,5 ton/ha), and P2 (5 ton/ha). Each combination treatment was repeated 3 times. The data were then analyzed using the F test and continued with Duncan Multiple Range Test Test (DMRT) level of 95%. The results showed that the interaction between the two treatments were no significant different. Availability Potassium gradually decreased with an increase in the dose of volcanic ash Kelud, allegedly because of the low value of the total potassium Kelud volcanic ash. The results of measurements of plant potassium uptake increased with increasing dose Kelud volcanic ash and manure.</p>
<p>This study was aimed to determine the effect of fertilizer dose combination of N, P, and K on growth and yield of peanut on Alfisols dryland. The experiment was conducted from April to September 2014 in Sukosari Village, Jumantono, Karanganyar with 3 factor completely randomized design arranged N (Urea) fertilizer dose (50,100,150) kg ha<sup>-1</sup>, P (SP-36) fertilizer dose (100,200,300) kg ha<sup>-1</sup> and K (ZK) fertilizer dose (75,150,225) kg ha<sup>-1</sup>. Statistical analysis using F test 5% followed by DMRT with 95% confidence level. The parameters observed were wet and dry weight of plant per sample, number of filled pods per sample, weight of pods per sample, and weight of dry seed per sample. Fertilizer dose combination of N, P and K significantly affect on dry weight. Fertilizer dose combination N and P significantly affect on number of filled pods and weight of pods per sample. Combination of P and K fertilizers significantly affect on dry seed weight. N fertilizer dose significantly affect on weight of dry seed per sample. The best fertilizer dose combination is P<sub>3</sub>K<sub>3</sub> treatment (300 kg ha<sup>-1</sup> and 225 kg ha<sup>-1</sup>) that can increased 57 % weight of dry seed if compared with recommendation dose.</p>
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