Citurs rootstocks are dependent of the growdcover management systems. This study aimed to identify the divergences of seven rootstocks for ‘Folha Murcha’ sweet orange trees in two groundcover management systems on a Paleudult. The study was performed at the IAPAR research station, in Paranavai, northwestern Paraná, Brazil. The experiment was in a complete random block design with threer replications for the bahiagrass (Paspalum notatum Flügge) groundcover treatment and one replication for the perennial groundnut legume (Arachis pintoi Krap. & Greg.). […]

An experiment was carried out at the Bebedouro Experimental Station in Petrolina, state of Pernambuco, from January 1999 to December 2001, on a sandy Yellow Eutrophic Argisol, with the objective of evaluating the effect of green fertilizers associated with liming and mineral and organic fertilization on the soil chemical attributes and the yield and quality of irrigated melon (Cucumis melo). A randomized complete block design with split-plots and four replications was used. The treatments assigned to the main plots were […]

The soil quality (SQ) evaluation is an important part of agricultural planning. It allows the identification and improvement of high-yielding management systems with characteristics of environment preservation. This study was carried out in two long-term soil management experiments (10 and 15 years) in Rio Grande do Sul State, Brazil. The main objective of this study was to evaluate the effectiveness of the Soil Quality Kit (SQK) developed by the Soil Quality Institute – ARS – USDA, compared to traditional soil science […]

Evaluating the decomposition of cover crop residues added to the soil allows improving the comprehension of appropriate nutrient supply for commercial crops. This study was carried out under field conditions aiming to evaluate the decomposition and nutrient release from the shoots of perennial herbaceous legumes. The treatments were green cover crops intercropped with banana: groundnut (Arachis pintoi Krapov. & W.C. Gregory.), tropical kudzu (Pueraria phaseoloides (Roxb.) Benth.), siratro (Macroptilium atropurpureum (Sessé & Moc. ex DC.) Urb.) and spontaneous vegetation (mainly […]

Nitrogen (N) is the mineral nutrient required in largest amounts and is the one that most influence corn yield. With the objective of evaluating the best timing and methods of N fertilizer application on corn in a no-tillage system in a cerrado soil, this experiment was carried out at the Vargem Grande farm in Montividiu County, state of Goiás, Brazil, on a dystrophic Red Latosol (Rhodic distrophic Haplustox) during the 1996/97 crop season. The experimental area had been cultivated with […]

Researchers have suggested soil organic matter (SOM) as a key indicator of soil quality (SQ), due to its positive influence in other important soil attributes. With the objective to evaluate the potential use of SOM as an indicator to select soil management systems, two long-term experiments carried out on Paleudults in southern Brazil were used. In the first ten-year experiment located in Santa Maria (Rio Grande do Sul State, Brazil) at the Federal University of Santa Maria, five treatments composed […]

The critical potassium level for fertilizer recommendation for soils in the State of Rio Grande do Sul (RS) and Santa Catarina (SC) with CEC from 5.1 to 15 cmolc dm-3 is 60 mg dm-3. However, until 2002 concentrations of 80 mg dm-3 had been used. Two experiments were carried out on an experimental area of the Department of Soil Science of the Federal University of Santa Maria (RS-Brazil) on a Sandy Typic Hapludalf under no-tillage. The objective of the study was to evaluate critical potassium levels […]

Tillage and plant species that compose the soil management and crop rotation systems have a pronounced effect on soil physical quality, especially on aggregate stability. This study aimed to evaluate the degree of aggregate stability of a soil cultivated under reduced tillage (RT) and conventional tillage (CT) using distinct summer cover crops. Two experiments were carried out in Chapecó, State of Santa Catarina, Brazil on a Hapludox under RT (1993-1998) and CT (1994-1998). Five crop systems were evaluated in each […]

Chemical control of green cover crops is common in no-till systems and nutrient mineralization of the residues left on the soil surface can be intensified by rainfall over time after the plant desiccation. Potassium leaching from six green cover crops was evaluated as affected by rainfall simulated at different stages after the herbicide application. Pearl millet (Pennisetum glaucum), guinea sorghum (Sorghum vulgare), black oat (Avena strigosa), triticale (Triticum secale), Indian hemp (Crotalaria juncea), and brachiaria (Brachiaria decumbens) were grown under […]

Cover crops along with proper soil management recover or maintain soil physical properties such as aggregation. The objective of this study was to determine the effect of cropping systems, cover crops, and soil organic matter (SOM) content on the temporal variation of soil aggregation in an Hapludalf in its natural state and under different cropping systems. The experiment was conducted at the experimental station of the Soil Department of the UFSM, Brazil. Undisturbed soil samples were collected in 60 day-intervals throughout […]