scholarly journals SPATIAL VARIABILITY OF THE GRANULOMETRIC FRACTIONS AND CHEMICAL ATTRIBUTES OF A SANDY SOIL UNDER A NO-TILLAGE SYSTEM

2016 ◽  
Vol 2 (1) ◽  
pp. 67
Author(s):  
Osvaldo Guedes Filho ◽  
Sidney Rosa Vieira ◽  
Glécio Machado Siqueira ◽  
Márcio Koiti Chiba
Keyword(s):  
Spatial Variability ◽  
Sandy Soil ◽  
No Tillage ◽  
Tillage System ◽  
Chemical Attributes

scholarly journals Chemical attributes of a Hapludox soil after nine years of pig slurry application

2012 ◽  
Vol 47 (12) ◽  
pp. 1766-1773 ◽  
Author(s):  
Milton da Veiga ◽  
Carla Maria Pandolfo ◽  
Alvadi Antonio Balbinot Junior ◽  
Evandro Spagnollo
Keyword(s):  
Chemical Reaction ◽  
Soil Samples ◽  
Pig Slurry ◽  
No Tillage ◽  
Nutrient Contents ◽  
Continuous Application ◽  
Tillage System ◽  
Chemical Attributes ◽  
High Doses ◽  
Cu And Zn

The objective of this study was to evaluate the pig slurry application effects on chemical attributes of a Hapludox soil managed under no-tillage system. Treatments consisted of 50, 100 and 200 m³ ha-1 per year of pig slurry application, and a control with replacement of P and K exported through harvested grains. Attributes related to soil chemical reaction, exchange complex, and nutrient contents were determined in soil samples collected in the ninth year of experimentation from 0 - 0.025, 0.025 - 0.05, 0.05 - 0.10, 0.10 - 0.20, 0.20 - 0.40 and 0.40 - 0.60 m soil depths. The continuous application of high doses of pig slurry on the Oxisol surface under no-tillage acidifies the soil and increases Al, P, Cu, and Zn contents down to 0.2-m depth, and K levels down to 0.6-m depth.

scholarly journals SPATIAL VARIABILITY OF SOIL RESISTANCE TO PENETRATION IN NO TILLAGE SYSTEM

2018 ◽  
Vol 38 (5) ◽  
pp. 697-704 ◽  
Author(s):  
Jorge W. Cortez ◽  
Wéliton P. da S. Matos ◽  
Sálvio N. S. Arcoverde ◽  
Victor H. Cavassini ◽  
Igor Q. M. Valente
Keyword(s):  
Spatial Variability ◽  
Soil Resistance ◽  
No Tillage ◽  
Tillage System ◽  
Resistance To Penetration

scholarly journals SULFENTRAZONE SELECTIVITY AND EFFICIENCY IN CASSAVA CROPS IN SANDY AND CLAYEY SOILS

2015 ◽  
Vol 33 (4) ◽  
pp. 787-793 ◽  
Author(s):  
N.V. COSTA ◽  
S.D. FERREIRA ◽  
J.R. RAMELLA ◽  
G. MORATELLI ◽  
R.F. DOURADO
Keyword(s):  
Experimental Design ◽  
Sandy Soil ◽  
Active Ingredient ◽  
Clayey Soil ◽  
Soil Conditions ◽  
No Tillage ◽  
Clayey Soils ◽  
Conventional System ◽  
Productive Potential ◽  
Tillage System

ABSTRACT Weeds have the potential to dramatically interfere in cassava cultivation, reducing its productive potential; however, there are few studies on the selective herbicides in this crop. Therefore, the objective was to evaluate in this work the selectivity and efficiency of sulfentrazone in cassava crops grown in sandy and clayey soils. Two experiments were carried out: The first one was carried out in sandy soil conditions in the conventional system; and the second one was carried out in clayey soil conditions in the no-tillage system. The experimental design was a randomized block with four replications. The treatments consisted in doses of 250, 500, 750 and 1,000 g ha-1 of sulfentrazone, and weeded and non-weeded controls. Sulfentrazone application in cassava crops has linearly reduced the production of roots in a proportion of 0.0153 and 0.0107 t ha-1 at each increment in grams of the active ingredient, respectively. It was concluded that sulfentrazone was not selective for cassava crops grown both in sandy and in clayey soil; however, it was highly effective in weed control in both soils.

scholarly journals Atributos químicos do solo e produtividade da soja após milho, braquiária e feijão-caupi em latossolo na região do cerrado

2020 ◽  
Vol 16 (2) ◽  
pp. 16-28
Author(s):  
Luan Marlon Ribeiro ◽  
Willian Daniel de Souza ◽  
Gessí Ceccon
Keyword(s):  
Yield Components ◽  
Exchange Capacity ◽  
No Tillage ◽  
Soybean Yield ◽  
Brachiaria Ruziziensis ◽  
Tillage System ◽  
Main Plot ◽  
Winter Crops ◽  
Chemical Attributes ◽  
Red Latosol

The objective of this study was to evaluate soil chemical attributes and yield components of soybean after maize, brachiaria and cowpea in an oxisol in the Cerrado region. The experiment was carried out at Embrapa-CPAO experimental area in Dourados-MS, Brazil, in the 2014/15 crop year, in a clayey dystroferric Red Latosol under no-tillage system (SPD). The experimental design was in randomized blocks with split plots with four replications. The soil chemical evaluations were carried out in soybean R1stage, being considered as the main plot the fall-winter crops (Brachiaria ruziziensis, safrinha corn, intercropping with B. ruziziensisand cowpea) and the subplots as soil depths (0-10; 10-20; 20-30 and 30-40 cm). For soybean yield components, fall-winter crops and subplots were soybean cultivars (BRS 284 and BRS 360 RR). In general, previous soybean crops in SPD provided higher contents of some nutrients at depths from 0 to 10 cm, in addition to higher cation exchange capacity, base saturation and soil organic matter. Cowpea, safrinha corn and B. ruziziensisprovided conditions for higher soybean yield. BRS 284 presented higher number of grains per plant, however BRS 360 RR proved to be more productive.

scholarly journals Influence of Limestone and Gypsum Application on Chemical Attributes of Dystrophic Yellow Latosol Soil and Corn Yield in Eastern Amazon

2020 ◽  
Vol 8 (3) ◽  
pp. 363
Author(s):  
Sidney Daniel Araújo da Costa ◽  
Edilson Carvalho Brasil ◽  
Mário Lopes da Silva Júnior
Keyword(s):  
Calcium Content ◽  
Soil Samples ◽  
Corn Yield ◽  
No Tillage ◽  
Soil Calcium ◽  
Tillage System ◽  
Chemical Attributes ◽  
Chemical Conditions ◽  
Mg Content ◽  
Gypsum Application

The objective of this study was to evaluate changes in the chemical attributes of the soil caused by the use of limestone associated or not to with gypsum in no-tillage system. The experiment was conducted on a dystrophic Yellow Latosol in Pará state, Brazil. The experimental design was in randomized blocks in split plots with three replications. The treatments consisted of five doses of limestone (0, 1, 2, 3 and 4 t ha-1), with and without gypsum (0, 0.5 and 1 t ha-1). Soil samples were collected at depths of 0-20 and 20-40 cm. There was a significant effect on the analyzed variables at both depths. The doses of 3.64 and 2.19 t ha-1 of limestone associated with 0.5 t ha-1 of gypsum, were responsible for the largest increase in soil calcium content in the 0-20 and 20-40 cm layers, respectively. The highest increase in Ca + Mg content was found at 3.63 t ha-1 limestone combined with 0.5 t ha-1 gypsum. It was observed that 3.13 t ha-1 of limestone combined with 0.5 t of gypsum increased soil CEC. The 2.89 t ha-1 dose of limestone combined with 0.5 t of gypsum contributed to the increase in base saturation (V%). The use of limestone and gypsum promotes soil chemical conditions, as reflected by increased corn yield when compared with control (no treatment) plots. 

scholarly journals DESEMPENHO DE CULTIVARES DE FEIJOEIRO IRRIGADO NO ECÓTONO CERRADO-AMAZÔNIA

Nativa ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 244
Author(s):  
Matheus Bortolanza Soares ◽  
Joaquim Pedro De Lima ◽  
Onã Da Silva Freddi ◽  
Tauan Rimoldi Tavanti ◽  
Renan Francisco Rimoldi Tavanti
Keyword(s):  
Phaseolus Vulgaris ◽  
Spatial Variability ◽  
Soil Fertility ◽  
Bootstrap Method ◽  
Descriptive Analysis ◽  
Limiting Factors ◽  
No Tillage ◽  
Phaseolus Vulgaris L ◽  
Tillage System ◽  
Aluminum Saturation

O uso da irrigação por pivô central favorece o cultivo do feijoeiro de terceira safra, contudo, limitações à produtividade são observadas quando cultivados em sistema de semeadura direta, sendo a compactação superficial, incidência de nematoides e variabilidade espacial vertical e horizontal dos nutrientes do solo os principais fatores limitantes deste sistema. O objetivo do estudo foi avaliar o desempenho de cultivares de feijoeiro irrigado em terceira safra, cultivados em sistema de semeadura direta e sua correlação com a fertilidade do solo e incidência de nematoides na região de ecótono Cerrado-Amazônia. O experimento foi desenvolvido no município de Sorriso-MT em um Latossolo Vermelho-Amarelo Distrófico. Os tratamentos foram constituídos por quatro cultivares de feijão, sendo eles: BRS Estilo, BRS Notável, BRS Ametista e BRS Pérola, em uma área total de 9900 m2, onde se determinou através de 83 pontos amostrais georreferenciados os atributos de planta e atributos químicos do solo. Os procedimentos estatísticos utilizados foram: análise descritiva dos dados, análise geoestatística e comparação de médias pelo método “bootstrap”. A maioria dos atributos apresentaram moderada à alta dependência espacial, com elevada variabilidade espacial. O aumento dos teores de potássio gerou incrementos na produtividade, enquanto que o aumento da incidência de nematoides, acidez potencial e saturação de alumínio no solo resultaram em redução. A maior produtividade observada foi da cultivar BRS Pérola, indicando boa aptidão para cultivo nesta região.Palavras-chave: Phaseolus vulgaris L., fertilidade do solo, nematóide, geoestatística. PERFORMANCE OF IRRIGATED BEAN CULTIVARS IN THE CERRADO-AMAZONIAN ECOTONE ABSTRACT: The use of central pivot irrigation favors third-crop bean cultivation, however, productivity limitations are observed when cultivated in a no-tillage system, with surface compaction, nematode incidence and vertical and horizontal spatial variability of soil nutrients, main limiting factors of this system. The objective of this study was evaluate the performance of third-crop irrigated bean cultivars grown under no-tillage system and the correlation with soil fertility and nematode incidence in the Cerrado-Amazonian ecotone region. The experiment was developed in the Sorriso-MT county in a Dystrophic Red Yellow Latosol. The treatments consisted of four bean cultivars: BRS Estilo, BRS Notável, BRS Ametista and BRS Pérola, in a total area of 9900 m2, where soil chemical and plant attributes were determined through 83 georeferenced sampling points. The statistical procedures used were: descriptive analysis of the data, geostatistical analysis and comparison of means by the “bootstrap” method. Most of the attributes presented moderate to high spatial dependence, with high spatial variability. The increase of potassium contents generated increases in productivity, while the increase in the incidence of nematodes, potential acidity and aluminum saturation in the soil resulted in a reduction. The highest productivity observed was of the cultivar BRS Pérola, indicating good aptitude for cultivation in this region.Keywords: Phaseolus vulgaris L., soil fertility, nematode, geoestatistics.

scholarly journals Changes in Carbon Stocks and Chemical Attributes of an Oxisol as a Result of Adoption Period of No-tillage System in the Brazilian Eastern Amazon

2020 ◽  
Vol 8 (3) ◽  
pp. 106
Author(s):  
Edilson Carvalho Brasil ◽  
Rubia Carla Ribeiro Dantas ◽  
Mário Lopes Da Silva Júnior ◽  
Luis De Souza Freitas
Keyword(s):  
Brazilian Amazon ◽  
Soil Mass ◽  
Conventional Tillage ◽  
Carbon Stocks ◽  
Soil Samples ◽  
No Tillage ◽  
Cultivation System ◽  
Tillage System ◽  
Chemical Attributes ◽  
Over Time

The conversion of forest areas to grain cropping has promoted a decrease in soil organic matter stocks in the Amazon. This process is most striking when the conventional cultivation system is used. In order to evaluate the changes in soil carbon and nutrient stocks resulting from the time of adoption of the no tillage system in a dystrophic Yellow Oxisol of the Brazilian Amazon biome, a study was conducted in a grain producing area in the northeastern of Pará, Brazil. The treatments corresponded to the following systems: CT6- conventional tillage system with six years of implementation; No-tillage system with 3 (NT3), 4 (NT4) and 7 (NT7) years of implementation. All systems were always cultivated in corn / soybean rotation. Deformed and non-deformed soil samples were collected on a the 2013 crop year at 0-10, 10-20 and 20-40 cm depths. Stocks of carbon (SC) and phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg) were calculated by using the equivalent soil mass methodology. Regardless of depth, the NT showed higher SC values than the CT. The adoption of NT showed a tendency of increasing SC of the soil over time. Such increases were up to 36% of the NT7 compared to the CT6. In NT7, the stocks of K, Ca and Mg were higher in relation to PC6. The EC correlated positively with the stocks of K, Ca and Mg in the areas under NT, regardless of the time of system adoption, up to 40 cm deep, indicating improvements in the soil fertility.

scholarly journals Spatial variability of weeds in an Oxisol under no-tillage system

2016 ◽  
Vol 11 (29) ◽  
pp. 2569-2576 ◽  
Author(s):  
Machado Siqueira Gl eacute cio ◽  
Alves Silva Raimunda ◽  
das Chagas Ferreira Aguiar Alana ◽  
Karlla Lima Costa Mayanna ◽  
Farias Fran ccedil a e Silva Ecirc nio
Keyword(s):  
Spatial Variability ◽  
No Tillage ◽  
Tillage System

scholarly journals Soil chemical attributes restricting grain yield in Oxisols under no-tillage system

2018 ◽  
Vol 53 (11) ◽  
pp. 1203-1212
Author(s):  
Geomar Mateus Corassa ◽  
Antônio Luís Santi ◽  
Vanderlei Rodrigues da Silva ◽  
Felipe Arthur Baron ◽  
Geovane Boschmann Reimche ◽  
...  
Keyword(s):  
Organic Matter ◽  
Grain Yield ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Sampling ◽  
High Yield ◽  
No Tillage ◽  
Yield Data ◽  
Tillage System ◽  
Chemical Attributes

Abstract: The objective of this work was to identify soil chemical attributes restricting grain yield in Oxisols under the no-tillage system, using directed soil sampling. High, medium, and low yield zones were defined in two agricultural fields using historical yield data of several crops. The yield zones were defined based on the harvest maps of the following crops: corn in 2008/2009, white oat in 2009, and corn in 2012/2013 in field I, with 117.70 ha; and corn in 2009/2010, soybean in 2010/2011, and wheat in 2012 in field II, with 107.30 ha. Soil sampling points were georeferenced in each yield zone, where samples were collected at eight soil depths, spaced 0.05 m apart, totaling 80 variables. Low yields were associated with low cation exchange capacity, low phosphorus and organic matter contents, and high clay content. In both studied fields, the highest organic matter content in the subsurface layers was the main indicator of high yield. Soil sampling considering yield zones is an efficient strategy to identify chemical attributes restricting grain yield and also allows guiding more precise site-specific interventions.

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