The broadcast application of phosphate fertilizers may be more effective than localized application methods for the growth of corn in medium textured oxisol, which have lower phosphorus (P) adsorption capacity. This study aimed to evaluate three phosphate fertilizer application methods at five different doses onto corn grown in oxisol, over two seasons. The experiment was conducted on corn crops in Passos city, Minas Gerais state, Brazil. Stripes with split plots were used to investigate the different application methods where each plot represented double furrow, single furrow, or broadcast application. Within the sub plots, the five doses (0.0, 50, 100, 200, and 400 kg ha −1) of phosphorus pentoxide (P 2 O 5) as granulated monoammonium phosphate (MAP) were applied. Four replications were used. The doses were reapplied in the second cultivation year only for the localized treatments (single and double furrow). The nitrogen in the MAP was held constant among treatments. The corn grain yield in both years was dependent upon both dose and application method, primarily for the single furrow and broadcast methods. In the first year, the broadcast application method of P fertilizer at a estimated dose of 319 kg ha −1 of P 2 O 5 provided a greater accumulated yield over two seasons. Broadcast application is therefore a viable method for growing corn with a reduced spacing distribution on medium textured oxisol.
Objetivou-se avaliar a diferença do estado nutricional de nitrogênio em cultivares de cana de açúcar sob irrigação subterrânea por meio da coleta da folha+1 e folha+3. O experimento consistiu em três fatores de manejo de irrigação e cinco cultivares de cana-de-açúcar, sendo eles irrigação suplementar, irrigação deficitária e sequeiro e as cultivares de cana-de-açúcar estudadas foram CTC4, IAC3046, IAC1099, IAC5000 e RB8515. As doses de adubos aplicadas foram 180 kg ha-1 de N, 240 kg ha-1 de K2O, 90 kg ha-1 de P2O5 e 45 kg ha-1 de S. Nos tratamentos irrigados, as aplicações dos fertilizantes foram realizadas via água de irrigação e no sequeiro foram aplicados manualmente. Foram coletadas 102 amostras de folha +3 e 102 amostras da folha+1, sendo que cada amostra foi constituída de 6 folhas coletadas aletoriamente em cada parcela. Para folha +3 a cultivar que respondeu mais a adubação foi a IAC1099 no sequeiro, e para a folha +1, foi a cultivar IAC3046 no sistema de irrigação deficitário. Independentemente de qual folha coletada, +3 ou +1, no geral, o tratamento não irrigado, foi a que respondeu mais a adubação.
The objective of this study was to evaluate the composting process made from different combinations of organic residues and to gain agronomic knowledge about the final product. The experimental design was randomized blocks, with five treatments: T1-50% sawdust, 35% fruit / vegetable husks and 15% coffee grounds and filter; T2-50% sawdust, 30% fruit / vegetable peels and 20% coffee grounds and filter; T3-60% sawdust, 30% fruit / vegetable peel and 10% coffee grounds and filter; T4-60% sawdust, 20% fruit / vegetable peels and 20% coffee grounds and filter; and T5-70% sawdust, 20% fruit / vegetable peels and 10% coffee grounds and filter and four replicates. The parameters monitored daily were temperature and humidity. After 140 days of initiation, the sample was collected for analysis. The material was analyzed in the soil and leaf fertility laboratory of the UEMG Unit Passos to determine the organic matter content, C / N ratio, pH and macronutrient and micronutrient content. Treatments 1 and 2 presented the best values in relation to the other treatments, due to the lower percentage of sawdust. The low ambient temperatures in the composting process, the high C / N ratio of the sawdust, the proportion of residues used in the formation of the compost and the volume of the material may have had a negative influence on the composting process.
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