Open Access Method Article

Methodology to Evaluate the Fertilizer Distribution by Helical Doser from Seed Planter

David Peres da Rosa, Lucas Pagnussat, Alisson Alves, Felipe Pesini, Roger Toscan Spagnolo

Journal of Experimental Agriculture International, Page 1-7
DOI: 10.9734/jeai/2019/v31i530087

This article aims to develop a precision methodology, to evaluate the work of a helical doser from a seed planter. The experiment was carried out in two conditions, a bench in laboratory, and, in a seed planter in the field, comparing the proposed evaluation methodology in the laboratory, linear methodology (LM), against the ISO 5690/2 (1984) method. In the laboratory’s test, it was tested: 0°, +11° and -11° slope of doser. In LM, it was used a metal gutter with 125 polyethylene collectors, both placed next to the other. In the field, it was used only LM, and for such two doses were tested, 250 and 440kg ha-1. The variation coefficient (VC) in the LM, the 0º condition performed with the best dosage, varying from 10.15% to 13.76%, against 13.95% to 17.84% in the + 11° slope and 11.86% to 13.79% in the -11º. The VC compared in ISO 5690/2 method shows a very different result, indicating variations from 0.7 to 2.3%, which is 88% smaller than LM. In field, the VC increased to 25.70% to 40.96%. Comparing the VC of ISO 5690/2 with the field test, the differences are even bigger, 2.3% compared to 40.96%. The LM presents concise data to clearly observe variations in the working conditions of the fertilizer helical doser.

Open Access Original Research Article

Genetic Parameters and Population of Coriander Reaction to Meloidogyne incognita Race 1

Ana Maria Maciel dos Santos, Kleyton Danilo da Silva Costa, Cristina dos Santos Ribeiro Costa, Michelangelo de Oliveira Silva, Dimas Menezes, José Luiz Sandes de Carvalho Filho, Denisson Lima do Nascimento

Journal of Experimental Agriculture International, Page 1-8
DOI: 10.9734/jeai/2019/v31i530081

The genetic parameters provide indispensable information about the genetic behavior of the study population regarding the characters evaluated, providing subsidy to the breeder on the decision about the best selection method to adopt in order to realize a genetic gain and maintain adequate variability. In this sense, the present study was carried out to verify the reaction and to estimate genetic parameters of a population of coriander composed of two cultivars (Verdão and HTV Dom Luiz) and 49 half-siblings progenies parasitized by Meloidogyne incognita race 1. The experiment was conducted in a greenhouse in the Department of Agronomy of the Federal Rural University of Pernambuco. The 51 cultivars and progenies were arranged in a randomized block design with four replicates and each experimental plot was composed of eight plants. The sowing was carried out in a tray of 128 cell- expanded polystyrene filled with commercial substrate, 1,000 eggs/cell of the pathogen were inoculated on the same day of sowing. After 30 days of inoculation, the number of galls was quantified in the root system, the pathogen’s eggs were extracted and, after the quantification of the eggs, the reproduction factor was estimated for each genotype. Data of the three characteristics were compared by Scott-Knott clustering test, then classified as resistant or susceptible, and genetic parameters estimated. The genotypes differed from each other at 1% probability level for all the characters under study. Heritabilities were high and positive with values ​​of 75.91 for number of galls in the root system and 96.72 for the number of eggs. Based on the phenotypic and genotypic correlations, it was possible to select desired genotypes based on the number of galls in the initial selection cycles, making selection and recombination possible in the same cycle. Twelve (12) progenies were selected for their resistance to the pathogen.

Open Access Original Research Article

Assessment of Conformity to Areas under Permanent Preservation and Restricted Use within River Espinharas Hydrographic Sub-Basin

Felipe Silva de Medeiros, Joedla Rodrigues de Lima, Denize Monteiro dos Anjos, Maria José de Holanda Leite, Roberta Patrícia de Sousa Silva, Sérvio Túlio Pereira Justino, Luan da Silva Figueroa, Átila Bruno de Moraes Almeida, Allan Kardec de Sousa Araújo

Journal of Experimental Agriculture International, Page 1-13
DOI: 10.9734/jeai/2019/v31i530082

The changes made in the natural dynamics cause risks that influence the equilibrium, terrestrial and atmospheric. The aim of the study was to characterize the land cover and land use of the Espinharas river sub-basin, with emphasis on the Permanent Preservation Areas (APP) and Areas of Restricted Use (ARU). The Sub-basin of rio Espinharas is part of the Northern Country Depression, it has one of the most typical landscapes of the northeastern semi-arid region. For the analyzes, multispectral images of the Landsat 8 OLI satellites were used, from the orbits and points 215/65, 216/64, bands 3, 4 and 5. The delineation of the sub-basin began with obtaining the hydrological attributes in the Software QGIS. For the identification of the areas of land use conflicts in APP and ARU, the map algebra was used to perform an overlay of the land cover and use map with the Map of the APP and ARU, using SIG Idrisi Software. The classes of land use and land cover in the SBH of the Espinharas River has the predominance of the Open Arboreal Shrub Caatinga (OASC) typologies with 2,239.37 km² (68.13%), Closed Arboreal Shrub Caatinga (CASC) with 203.17 km² (6.18%) of the total SBH area. It was also verified that 752.67 km² (22.90%) of the total area corresponds to anthropism. The satellite images allowed to have a clear, comprehensive and current view of the use and land cover of SBH of the river Espinharas. Discrimination, mapping and quantification of land use and land cover areas through the Geographical Information System (IDRISI, QGIS GRASS) classification allowed us to obtain results with greater agility regarding the integration and manipulation of the areas. The data obtained will help recovery plans and planning of the area, since a part of SBH is not complying with the current environmental legislation.

Open Access Original Research Article

Effect of Liquid Digestate on Agricultural Soil – I: Growth Dynamics of Zea mays Plant

H. O. Stanley, C. B. Ogbonna, G. O. Abu, C. J. Ugboma

Journal of Experimental Agriculture International, Page 1-9
DOI: 10.9734/jeai/2019/v31i530083

The study was designed to model the effect of liquid digestate on growth dynamics of Zea mays plant. Maize seeds were subjected to various concentrations of liquid digestate (between 0% and 72%) using One-Factor Response Design with a total of ten (10) runs in 10L-capacity plastic pots containing 10kg of loamy soil. One set of experimental runs were treated with one-time application of the corresponding digestate concentration (OTDA). Another set of experimental runs were treated with two-time application of the corresponding digestate concentration (TTDA). The first application of the liquid digestate (for OTDA and TTDA) was conducted two weeks after sowing while the second application (for TTDA alone) was conducted three weeks after the first application. The height of maize plant in all set-ups was monitored for a period of 70 days. After the 70-day period, the plants were harvested for biomass estimation. In the soil set-ups treated with OTDA, crop growth rate (1.077cm/day) and biomass yield (22.37g/kg of digestate) of Zea mays plant peaked with 48% digestate after 70 days. In the soil set-ups treated TTDA, crop growth rate (1.321cm/day) and biomass yield (29.95g/kg) of Zea mays plant peaked with 72% digestate after the same period. Optimum response generated for the crop growth rate of Zea mays plant was approximately 1.038 cm/day with a standard error of 0.014 for the OTDA treatment and 1.165cm/day and a standard error of 0.006 for the TTDA treatment at digestate concentration of 50% with a desirability of 0.928 respectively. Optimum response generated for biomass yield of the Zea mays plant was approximately 22.488 (g/kg) with a standard error of 0.621 for the OTDA treatment and 27.292 (g/kg) with a standard error of 0.399 for the TTDA treatment at digestate concentration of approximately 47.1% and a desirability of 0.930 respectively. The result suggests that the TTDA treatment method may have enhanced the growth of the maize plant better than the OTDA treatment method.

Open Access Original Research Article

Haematological and Biochemical Profiles of West African Dwarf Goats Fed Cochlospermum planchonii Root Powder in Their Diet

L. I. Mhomga, C. O. Nwosu, B. N. Marire

Journal of Experimental Agriculture International, Page 1-12
DOI: 10.9734/jeai/2019/v31i530084

This study was conducted to investigate the effects of feeding varying levels of Cochlospermum planchonii using 25 WAD goats. The study lasted for 84 days during which feed intake and haematological and biochemical parameters were monitored in 25 goats using a completely randomized design. Five diets consisting of pulverized Cochlospermum planchonii rhizome at varying proportions of 0 %. 5 %, 10 %, 20 % and 40 % respectively and designated as T1, T2, T3, T4 and T5 were compounded with other feed ingredients. Goats were offered concentrate and Gamba grass (Andropogon gayanus) at 08:30 am. The results obtained revealed that there was no significant difference in dry matter intake of forage but the amount of concentrate consumed by T5 was significantly (P < 0.05) lower than the other treatments. Haematological parameters such as; PCV, Hb, RBC, MCV, MCH, MCHC, WBC, neutrophils, lymphocytes and eosinophils did not differ across the treatments, while biochemical parameters such as; total protein, albumin, globulin, glucose, creatinine, urea and ALT were also similar across the treatments, however, cholesterol, AST and ALP were significantly different (P < 0.05). The study revealed that inclusion of Cochlospermum planchonii in the diets of WAD goats had no adverse effects on the haematological and serum biochemical parameters. Therefore, dietary inclusion or drenching with the plant is safe especially at 20 % inclusion.