Open Access Short Research Article

Participatory Varieties Selection and Evaluation of Improved Sweet Potato (Ipomoea batatas (L.) On-Farm at Different Agro-ecologies in Wolaita Zones Southern, Ethiopia

Birhanu Lencha Kiffo

Journal of Experimental Agriculture International, Page 1-6
DOI: 10.9734/jeai/2019/v40i230363

Aim: Ethiopia is considered to be one of the major producers of sweet potato and involves major lands for this purpose. Whereas, varieties of sweet potato that yields maximum are not yet known. So this particular study is aimed to identify the variety for high yield, quality sweet potato, as well as its quantitative evaluation to be done.

Materials and Methods: Area situated at Wolaita zone of SNNP regional state is considered as study venue; whereas the performance of fields is evaluated and specified the number of crop yield of that particular area.

Results and Discussion: Eleven sweet potato varieties and four local varieties were prepared for the preliminary evaluation. Observations came up with the following varieties namely OFSP1, Kulfo, Koka 6 and Hawassa 83 which were mostly preferred by farmers. Both sweet potatoes had high acceptability; with an average score of 10,11,12,16, (A) and 17, 18 19, (B) out of a maximum of 20, without any significant differences in preference. The varieties were divided into four sets, with each set having two test varieties and the check variety. This is to ensure that farmers will not have difficulty in evaluating and comparing too many varieties.

Conclusion: Variety of the potatoes that are preferred by the farmers is different from each other, which are come up with Participatory varietal selection (PVS) technique. So as differences in ranking are also preferred by them, which later ensure the genetically diverse factors and differentials in growing yield of the crops.

Open Access Original Research Article

Fertilization with Silicon in Sweet Pepper Improved Plants Grown under Salt Stress

Márcio de Souza Dias, Douglas José Marques, Hudson Carvalho Bianchini

Journal of Experimental Agriculture International, Page 1-12
DOI: 10.9734/jeai/2019/v40i230359

Aims: The objective of this research was to investigate the effect of calcium silicate on gaseous exchanges and production factors in the sweet pepper, cultivated under conditions of soil salinity induced by potassium fertilization, in protected cultivation.

Study Design: The experiment was arranged in a randomized complete block design in a 2 × 5 factorial scheme with five replications.

Place and Duration of Study: The experiment was conducted in the sector of Olericultura and Experimentation of the course of Agronomy from October 12, 2018 to February 2019.

Methodology: The experiment was arranged in a randomized complete block design in a 2 × 5 factorial scheme (two sources of correction: calcareous and silicon and five increasing rates of KCl equivalent to 150, 300, 450, 600 and 700 kg ha-1 of K2O). Ten treatments with five replicates where each experimental unit consisted of a polyethylene pot, with a volume of 19 dm3. The electrical conductivity, the determination and quantification of silicon in soil and plant, liquid photosynthesis, stomatal conductance, intercellular CO2 concentration, transpiration, water use efficiency and instantaneous carboxylation efficiency were analyzed.

Results: With the increase of K2O in the soil there was a tendency of reduction in liquid photosynthesis, transpiration, stomatal conductance, intercellular CO2 concentration, water use efficiency and instantaneous carboxylation efficiency in the presence and absence of calcium silicate. Higher rates of K2O (300, 450 and 600 kg ha-1) reduced the length and yield of sweet pepper fruits in the presence and absence of calcium silicate. The rate of 150 Kg K2O favored the growth of sweet pepper plants in the presence of calcium silicate.

Conclusion: It is concluded from the research that the dose of 300 kg ha-1 of K2O, in the presence of calcium silicate, provided the best results for the electrical conductivity of 2.76 dS m-1, silicon content in the soil of 5.70 mg kg-1, 14% silicon leaf content, improving photosynthetic rates, transpiration, water use efficiency and fruit production. The increase in salinity reduced fruit yield, in the presence and absence of Si.

Open Access Original Research Article

Growth and Development of Passion Fruit Seedlings under Irrigation with Salt Water and Biofertilizer

Francisco de Oliveira Mesquita, Patricya Lorenna de Brito Rodrigues, Ana Célia Maia Meireles, José Leonardo Noronha Cardoso, Thiago de Souza Ribeiro, Antônio Gustavo de Luna Souto, Francisco Roberto de Azevedo, Salomão de Sousa Medeiros, Rafael Oliveira Batista

Journal of Experimental Agriculture International, Page 1-13
DOI: 10.9734/jeai/2019/v40i230360

The yellow passion fruit is a plant climbing botanically that has a good geographical distribution in Brazil, with more than 150 species in the country. The presence of salts in soil and irrigation water is one of the main obstacles in agriculture in the world, caused by low rainfall and high evapotranspirative rates causing the salts to accumulate in the soil. However, alternatives have been sought to try to mitigate such limitations of seedling production, such as the use of biofertilizers in the soil. In this way, the objective was to evaluate the growth and development of yellow passion fruit seedlings under the effects of irrigation water salinity and the use of bovine biofertilizer on the substrate. An experiment was carried out in a greenhouse in the Center for Agrarian Sciences and Biodiversity, from october/2017 tomarch/2018, in county of Crato-Ceara, Brazil. The substrate used was the first 20 cm material of a yellow Red Argisol. The experimental design was completely randomized design (C.R.D) in a factorial scheme 5x2, referring to the electrical conductivity values ​​of the irrigation water: 0.5; 1.0; 2.0; 3.0 and 4.0 dS m-1, in the soil without and with common biofertilizer, with three replicates. The biofertilizer, after being diluted in non-saline water (0.5 dS m-1) in the ratio of 1:3, was applied only once to 10% of the substrate volume two days before sowing. The increase in the salinity of irrigation water negatively affected the initial behavior of the passion fruit seedlings in terms of growth and development, especially in the treatments that did not receive the organic feed.

Open Access Original Research Article

Path Analysis of Vegetative Characteristics in Conilon Coffee Production Consortiated with Green Fertilizers in Tropical Climate

Mario Euclides Pechara da Costa Jaeggi, Fábio Cunha Coelho, Israel Martins Pereira, Alex Justino Zacarias, Geraldo de Amaral Gravina, Wallace Luis de Lima, Lucas Louzada Pereira, Taís Rizzo Moreira, Samuel Ferreira da Silva, Magno do Carmo Parajara

Journal of Experimental Agriculture International, Page 1-11
DOI: 10.9734/jeai/2019/v40i230361

The objective of this study was to evaluate the relationship between morphoagronomic characters and coffee productivity and their direct and indirect effects under the influence of different types of green fertilizers. The experiment was carried out in the field followed by the sampling method in a pre-established coffee plantation, installed in soil with a slope of 11% in the Southern Region of the State of Espírito Santo. The intercropping of coffee with green fertilizers studied were pigeon pea, jack bean, velvet bean, and wild Mexican sunflower, as well as a control treatment without green fertilizers. The experimental unit consisted of a coffee plant, clonal variety "Incaper 8142" Conilon Vitoria, with a spacing of 2.30 x 2.60 meters, with a crop age of seven years, using the border of at least one coffee plant between experimental units. Eight morphoagronomic characteristics were measured, having as main dependent variable the productivity (in kg per plant) obtained in the harvest of 2015, and as primary explanatory characteristics: plant height, orthotropic branch diameter, plagiotropic branch diameter, number of leaves, number of nodes, number of orthotropic branches, number of plagiotropic branches and number of productive nodes. To increase productivity, coffee plants with the highest number of orthotropic branches and number of plagiotropic branches should be selected. The characteristics of greater direct contribution were a number of nodes and the number of productive nodes.

Open Access Original Research Article

Dehydration of Fermented Manioc Rasp

Luís Eugênio Lessa Bulhões, Rogério Teixeira Duarte, Cícero Luiz Calazans de Lima, Maria José de Holanda Leite, Igor Cavalcante Torres, Allan Anderson Santana, Ramon da Silva Souza, David Jossue López Espinosa

Journal of Experimental Agriculture International, Page 1-5
DOI: 10.9734/jeai/2019/v40i230362

The objective of this work was to evaluate the quality of the Ripa enriched with urea, yeast and sugar cane molasses, fermented and subjected to the drying process. Using as parameters: moisture content, Brix, pH, acidity and protein content. We used a completely randomized design with ten replications, two treatments and one control. The model included non-fermented (RNFM) and fermented (RFM) treatments of the variety of Rosinha cassava. Fermentation was performed during 132 hours under ambient conditions, with a 10% yeast treatment (w/V), 4% Urea (w/V) and 20% molasses (w/V) and the other 70 ml of distilled water. Regarding the moisture content of the material after the dehydration period, mean values between 46.42% and 58.33% were observed. The Brix degree of the water treatment and the control samples did not differ, however, differed from the treatment urea + molasses + yeast, which presented the highest values of this parameter. The pH averages ranged from 4.49 to 7.85, differing statistically. Titratable acidity ranged from 1.760 to 14.040. A considerable gain of crude protein was observed in the treatment urea + molasses + yeast, which was statistically higher than the others.