The corn crop is among the most important activities in Brazil, as one of the main export products. The objective of this work was to analyze agronomic performance of maize genotypes in a consortium with the bean variety IAC Alvorada. The experiment was conducted in 2014 in the months from August to December in the experimental area of the Federal University of Alagoas in Rio Largo city, and used a randomized block design in a factorial scheme (4x2) four corn genotypes: Alagoano, Viçosense, Nordestino and BRS 5037 (Cruzeta) in two production systems, plus a complementary treatment. We evaluated the following variables for corn: plant height, stem diameter, the first ear height, weight hundredfold, number of grain row, yield and equivalent production of corn. For beans was evaluated grain yield. The polyculture showed higher equivalent corn yield, 21,270 kg ha-1. He Viçosense, Nordestino and Alagoano genotypes (4640 kg ha-1) showed the highest production yields. The consortium did not influence in any of corn agronomic characteristics. The genotypes showed favorable rates of cropping systems.
Alex Serafim de Lima, Jackson de Mesquita Alves, Francisco de Oliveira Mesquita, Evandro Franklin de Mesquita, Caio da Silva Sousa, Francisca Lacerda da Silva, Anailson de Sousa Alves, Liliane da Silva Soares
The objective is to evaluate the effect of different doses of biofertilizer on initial production of seedlings of passion yellow under coefficients of organic matter and water depletion in the substrate. The study was conducted during the period from December 2016 to March 2017, in protected environment at the State University of Paraiba, Campus IV - Catole do Rocha PB. The experimental design used was completely randomized design (CRD), with factorial scheme type 5x2x2, referring to the doses of bovine biofertilizer (0; 200; 400; 600 and 800 mL) diluted in proportion of 1:1, substrate levels. S1- 70% of soil (1400 mL) + 30% bovine manure (600 mL); S2 - 30% of soil (600 mL) + 70% of bovine manure (1400 mL) and two levels of water in the soil (LAS): L1 = 100% of the available water on the substrate (AWS) and L2 = 60% of water available in the substrate, with 4 repetitions, totaling 80 experimental units. After the sowing to 110 days after the emergency (DAE) we evaluated the plant height (PH); stem diameter (SD); water consumption index (WCI); relative water content in the tissues (RWCT); dickson quality index (DQI); water use efficiency (WUE) and soil electrical conductivity (SEC). The concentration of biofertilizer about the composition of the substrate, as well as the association with water blades, that influence the initial development of the yellow passion fruits seedlings. The concentration of biofertilizer on composition of the substrate, as well as your association with blades of water influence on the initial development of the seedlings of yellow passion.
Background: Sorghum (Sorghum bicolor (L.) Moench) is one of the world’s most important nutritional cereal crops and also the major staple food and fodder crop of millions of people in semi-arid tropics. It is considered as the ‘King of millets’ and extensively grown in Africa, China, USA, Mexico and India, but sorghum productivity is highly influenced by chosen genotype, climatic factors of a given location and management practices followed, thus requires testing new genotypes as and when released for the yielding potential and response to management.
Aims: The current generation of crop models requires calibration as and when new genotype (cultivar) was introduced into the model vis-à-vis cultivar specific coefficients. Therefore, present study calibrated and evaluated the DSSAT-CERES-Sorghum model for four new genotypes introduced.
Study Design: The data from field experiment with four genotypes and three dates of sowing conducted during Kharif seasons of 2011 and 2012 under All India Coordinated Research Project (AICRP) on Sorghum at Main Agricultural Research Station, Dharwad, Karnataka, India was used for model calibration (2011 data) and evaluation (2012 data). The borrowed data included phenology, biomass and yield components.
Results and Discussion: Calibration process showed anthesis, physiological maturity and yield were perfectly matched using 2011 data which achieved RMSE value of 0.0, 1.41 and 97.17 for anthesis, maturity and grain yield, respectively, and when 2012 data was used for evaluation the calibrated model could simulate with high accuracy as shown by minimum RMSE values of 2.94, 1.29 and 51.76 for anthesis, maturity and grain yield, respectively.
Conclusion: This exercise of calibration of crop specific parameters of four kharif sorghum genotypes using DSSAT-CERES-Sorghum model followed by evaluation of model using another independent set of data showed that DSSAT-CERES-Sorghum performed well and the model could be used as decision support tool for all those optimized four genotypes for various applications viz., optimizing dates of sowing, population, spacing and inputs.
The objective of this study was to estimate, through partial diallel cross, the combinatorial capacity of melon genotypes of the Momordica group and the expression of heterosis in the hybrids obtained for the characters: mean fruit mass (MFM), mean fruit length (MFL), mean fruit diameter (MFD), fruit length/diameter ratio (LDR), fruit internal cavity (FIC) and mean pulp thickness (MPT). Forty-one treatments (26 Hybrids and 15 parents) were evaluated in a randomized complete block design with four replications, conducted in a greenhouse at the Universidade Federal Rural de Pernambuco, Recife, Pernambuco, Brazil, between February and June 2015. The results showed the importance of the additive and non-additive genes effects, with a greater participation of additive gene action in the control of most characters. In accordance with estimation of the general combining ability – GCA, the genitors G-03, G-11, G-14, G-16 and G-18 were the ones that presented the best results for MFM, MFL, MFD and MPT. The effect of the specific combining ability – SCA was important in controlling the majority of the characters, in 30.7% of the hybrid combinations and in 15 of them the heterosis was positive for MFM, MFL, MFD and MPT. The genotypes presented good productivity, thick pulp and satisfactory fruit size and can be used in breeding programs to obtain superior genotypes.
In spite of global acceptance and wide use of micropropagation as a method for the production of disease free planting material and germplasm conservation, this practice has been slow and non-affordable in Sub-Saharan Africa. This is due to the high cost and non-availability of tissue culture media. Considering the importance of growth factors (micro and macro nutrients) in culture medium, it is inevitable to search for an alternative, cheaper and readily available source of these nutrients. This research therefore provided a natural substitute media formation for Cassava nodal culture. Sugar cane juice was substituted for sucrose (SC) in this research work. The result showed that the explants survived and produced foliage at 20 ml SC and 40 ml SC based media. The forest Top Soil (FTS) modified media produced more foliage (7), at 20 ml/200 ml than conventional media (5). Trona is a soft and porous salty evaporate deposit occurring in association with Neutron, Halite, Thernadite and other salts. Trona is a mixture of Chlorides, Carbonates, and Sulphate salts of Sodium, Calcium, Potassium, and Magnessium thus serving as a good source for these salts. 0.2 g of Trona gave the highest percentage 66% of nodal cutting that developed foliage. In conclusion, there was a positive response observed in the growth of the cassava nodes in the media modified with various natural nutrient sources. The use of these natural sources is encouraged because it is less costly and readily available rather than wait for the importation of the costly synthetic culture media.