ABSTRACT No-tillage (NT) has been largely adopted in Brazil as a strategy for soil conservation, but for the last decade, there have been governmental incentives for its adoption arising from its potential for soil C accumulation. Notwithstanding, the soil mulch formed from crop residues favors the maintenance of soil moisture and nutrients in the upper soil layers, which stimulates soil microbial activity and may increase the potential for nitrous oxide (N2O) emissions. In addition, double-cropping systems in the same year […]

ABSTRACT Microorganisms in the soil and rhizosphere can release part of the total phosphorus in the soil through solubilization, mineralization, and an increase of the root absorption surface. The ability of phosphate solubilizing bacteria and mycorrhizal fungi to promote higher yield and profitability in co-inoculated soybean was investigated. For this purpose, field and greenhouse experiments were conducted in the years 2020 and 2021 in Brazil. In the field, the first factor was composed of microorganism application on soybean (simple inoculation […]

ABSTRACT Waste resulted from the distillation of kayu putih leaves is a problem in almost all kayu putih refineries throughout Indonesia due to its enormous availability and un-utilization. It has potential to be used as an organic fertilizer source due to its nutrient content (macro and micro) which is higher than organic fertilizer from animals. The use of kayu putih waste is useful to complement and increase the efficiency of nitrogen fertilizer in soybean intercropping with kayu putih . This […]

ABSTRACT Establishing sufficiency ranges and critical levels of nutrients are important for a correct evaluation of plant nutrition through leaf diagnosis. This study aimed to propose critical levels and sufficiency ranges of macro and micronutrients based on leaf diagnosis of soybean plants. The database used was generated from 86 samples of the third trifoliate leaf without petiole, collected during the flowering stage from soybean plants of the main cultivars used in the states of Piauí and Maranhão, Northeast region of […]

ABSTRACT: High yields obtained from soybean [Glycine max (L.) Merrill], and consequent profits, are related to efficient symbiosis of soybean with nitrogen fixing bacteria of the Bradyrhizobium genus. Inoculation with strains belonging to the Bradyrhizobium japonicum, B. elkanii, and B. diazofficiens species, approved by the Brazilian Ministry of Agriculture (MAPA), is a common practice for this crop. However, variations in the composition of inoculants can change the quality of the product. The aim of this study was to genetically identify […]

Associated with the benefits of the no-till system for the soil, there may be the formation of a vertical gradient of fertility and a compacted layer caused by heavy farm machine traffic, which may modify the root growth of crops. The aim of this study was to evaluate the effect of rates and forms of phosphate fertilizer application and soil compaction by machine traffic on the physical properties and root system of soybeans and maize. The study was conducted in […]

Soybean is one of the annual crops most demanding of boron (B); however, borate fertilizer should be managed cautiously, especially in regard to application rates, because of the narrow range between the appropriate level and toxic level for this nutrient in the soil. Another important factor directly related to B availability to plants refers to soil water conditions. In this context, this study evaluated the effect of sources and application rates of B on soybean growth (Glycine max) in a […]

The effects on soil chemical properties brought about by cover crops vary considerably. This study was conducted to evaluate nutrient uptake by five cover crops used for grain, seed and forage production at different seed densities per hectare, as well as uptake by spontaneous vegetation, and their effect on the chemical properties of two Oxisols when grown in rotation with soybean and corn. The experiments were set up in Votuporanga, SP, Brazil and Selvíria, MS, Brazil in March 2008 after […]

The use and management of Quartzipsamments can influence soil organic matter (SOM), but the magnitude of these variations for the specific conditions in the Cerrado (savanna-like vegetation) is still poorly studied. The aim of this work was to study the variations in SOM in a Quartzipsamment, after the conversion of native vegetation to cropland (soybean-millet rotation). Soil was sampled from 0-5, 0-10, 0-20 and 0-40 cm depths of a commercial field in Alto Garças, Mato Grosso, Brazil, of plots under […]

Improper tillage operations cause serious problems of soil conservation, above all compaction, causing pore space reduction of mainly the macropores, and affecting the physical-hydric properties. The purpose of this study was to verify the influence of different periods of management systems on the maximum density of a Red Oxisol in Jaboticabal, São Paulo State, and establish correlations with soybean yield, relative density and the soil critical moisture for compaction. The experiment was arranged in a completely randomized design with a […]