VARIABILIDADE ESPACIAL DE PLANTAS DANINHAS NUM LATOSSOLO VERME- LHO SOB SISTEMA PLANTIO DIRETO. / SPATIAL VARIABILITY OF WEEDS OF AN RED LATOSOL (OXISOL) UNDER NO- TILLAGE SYSTEM.

The objective of this study was to evaluate the behavior of brown linseed, submitted to different spacing between lines. The experiment was carried out at the Federal University of Santa Maria, Frederico Westphalen Campus, under a typical eutrophic Red Latosol, from September to December 2013. The experimental design was a randomized complete block design with four replications and four treatments, with experimental plots of 4.0 × 3.0 meters, totaling 12.0 m². The treatments consisted of four line spaces, 17, 34, 51 and 68 cm. The following parameters were evaluated: dry matter, plant height, stem diameter, weight of one thousand seeds and grain yield. The spacing of 0.17 m was the one that stood out showing higher yield and agronomic characteristics favorable to the crop, such as a smaller stature of important plant from the point of view of a lower lodging and a greater production of dry matter, and consequently residual straw for cultivation in succession, this being a basic premise in areas under no-tillage system.

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

Colloquium Agrariae ◽

10.5747/ca.2020.v16.n2.a355 ◽

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.

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DESEMPENHO DE CULTIVARES DE FEIJOEIRO IRRIGADO NO ECÓTONO CERRADO-AMAZÔNIA

Nativa ◽

10.31413/nativa.v7i3.6494 ◽

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.

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

Journal of Geospatial Modelling ◽

10.22615/2526-1746-jgm-2.1-5889 ◽

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

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

African Journal of Agricultural Research ◽

10.5897/ajar2016.11120 ◽

2016 ◽

Vol 11 (29) ◽

pp. 2569-2576 ◽

Cited By ~ 1

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

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Scaling of pores in 3D images of Latosols (Oxisols) with contrasting mineralogy under a conservation management system

Soil Research ◽

10.1071/sr13238 ◽

2014 ◽

Vol 52 (3) ◽

pp. 231 ◽

Cited By ~ 8

Author(s):

Carla Eloize Carducci ◽

Geraldo César de Oliveira ◽

Nilton Curi ◽

Richard John Heck ◽

Diogo Francisco Rossoni

Keyword(s):

Spatial Variability ◽

Conservation Tillage ◽

Pore Space ◽

Soil Core ◽

Pore Characteristics ◽

3D Images ◽

Tillage System ◽

Different Depths ◽

Red Latosol ◽

Crop Area

The aim of this study was to evaluate the spatial and morphological configuration of the pore space in 3D images of Latosols with different mineralogy under a conservation tillage system in a coffee crop area. The visualisation and quantification of pore size distribution by data mining and spatial variability by semi-variogams were investigated in 3D images with 60-µm spatial resolution generated by X-ray CT scan (EVS/GE MS8x-130) in soil core samples collected at different depths of a kaolinitic Red-Yellow Latosol (RYL) and a gibbsitic Red Latosol (RL) from Brazil. Greater spatial variability occurred in the horizontal direction of the 3D image, a novel finding in this area of research. The pores detected were different between the Latosols studied, mainly at 0.20–0.34 m depth. The largest number (>4000) and volume (±30 mm3) of pores was found in the RL. The soil classes differed in 3D pore characteristics, and this aspect may be important in the characterisation of causes of pore variability. Sphericity was similar for both soils, with greater emphasis on pore classes with a diameter <0.4 mm, mainly at the 0.20–0.34 m depth. A higher percentage of spheroid pores occurred in RL (±25%), whereas the platy pores were more abundant in RYL (>15%).

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Alterations and spatial variability of soil fertility in successive years under no tillage system

Bragantia ◽

10.1590/s0006-87052010000500005 ◽

2010 ◽

Vol 69 (suppl) ◽

pp. 29-38 ◽

Cited By ~ 1

Author(s):

Marcio Koiti Chiba ◽

Sidney Rosa Vieira ◽

Antonio Paz González ◽

Sonia Carmela Falci Dechen ◽

Isabella Clerici de Maria

Keyword(s):

Spatial Variability ◽

Soil Fertility ◽

Soil Properties ◽

Chemical Elements ◽

Saturation Index ◽

Organic Matter Content ◽

No Tillage ◽

Ancillary Data ◽

Spatial Continuity ◽

Tillage System

This study was carried out in order to assess the spatial variability of some soil properties after adoption of no tillage system (NTS). A 19,200 m² plot was marked with a 20 x 20 m spacing grid. Crop yield and soil attributes, at 0-0.2 m deep layer, were measured in 63 points in 1985, 1987 and 1988. The spatial variability was assessed by semivariogram calculation using geostatistics. Soil base saturation index (BS) was interpolated by kriging and also, using a bivariate geostatistical method, the collocated cokriging (CLCK) using terrain elevation as ancillary data. Although, the coefficient of variation (Cv) for soil organic matter content decreased from 1985 (20.4%) to 1988 (10.7%), its mean value increased 32% in the same period. The soil fertility in 1985 was found to be more diverse (i.e. high Cv value), providing evidences that the clearing and subsequent no tillage cultivation increased soil homogeneity. Experimental semivariograms were best fitted to a spherical model. The cultivation under NTS improved the spatial continuity of the studied attributes at close distances. The range for most of the semivariograms of soil properties varied between 40 and 90 m. Kriged maps allowed distinguishing small areas with different chemical elements content. The CLCK approach resulted in maps with higher details and smoother contours in comparison to kriging and cokriging.

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Soil acidity and aluminum speciation affected by liming in the conversion of a natural pasture from the Brazilian Campos Biome into no-tillage system for grain production

Archives of Agronomy and Soil Science ◽

10.1080/03650340.2019.1605164 ◽

2019 ◽

Vol 66 (2) ◽

pp. 138-151 ◽

Cited By ~ 2

Author(s):

Alcione Miotto ◽

Tales Tiecher ◽

João Kaminski ◽

Gustavo Brunetto ◽

Lessandro De Conti ◽

...

Keyword(s):

Soil Acidity ◽

No Tillage ◽

Grain Production ◽

Aluminum Speciation ◽

Natural Pasture ◽

Tillage System

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Diversity and Longevity of the Soybean Debris Mycobiota in a No-Tillage System

Plant Disease ◽

10.1094/pdis.1997.81.5.530 ◽

1997 ◽

Vol 81 (5) ◽

pp. 530-534 ◽

Cited By ~ 25

Author(s):

R. E. Baird ◽

B. G. Mullinix ◽

A. B. Peery ◽

M. L. Lang

Keyword(s):

Cover Crops ◽

Survival Rates ◽

Fungal Species ◽

No Tillage ◽

Cercospora Kikuchii ◽

Tillage System ◽

Mesh Bags ◽

Colletotrichum Spp ◽

The Mean ◽

Total Fungi

The survival of the mycobiota on pod and stem debris of soybean produced in a no-tillage system with cover crops of alfalfa, canola, rye, or wheat or with no cover was studied during 1994 and 1995. Fiberglass mesh bags containing pods and stems were assayed every 28 to 31 days to determine the isolation frequency of fungi. Over 90% of the 11,906 isolates obtained were members of the Deuteromycotina. The most common genera isolated were Alternaria, Cercos-pora, Colletotrichum, Epicoccum, Fusarium, and Phoma. Alternaria spp. had the greatest isolation frequencies and constituted 40% of the total cultures. Numbers of total fungi (all fungi isolated) on sampling dates in 1994 were similar to the totals in 1995. In May 1994, the mean isolation rates for many of the fungal species were significantly lower (P = 0.05) in several of the cover crops, but no consistent pattern could be determined. Common soybean pathogens isolated included Colletotrichum spp., Diaporthe spp., and Cercospora kikuchii. Fusarium graminearum, which is responsible for several diseases of maize and wheat, was commonly isolated during this study. Of the Diaporthe spp. (anamorph Phomopsis spp.), 87% were identified as D. phaseolorum var. sojae. Colletotrichum spp. were identified as C. truncatum in 85% of the isolates, C. destructivum (teleomorph Glomerella glycines) in 12%, and both species in 3%. Cercospora kikuchii was more commonly isolated from pods than from stem tissue, and Colletotrichum spp. occurred more frequently on stems. Isolation frequencies of Diaporthe spp. were greater in May of both years than in the preceding months. These results show that no-tillage soybean debris harbors numerous fungi pathogenic to soybean, and producers who grow soybeans continuously may find more disease in this crop and lower yields. Fungi that attack crops such as maize and wheat were commonly isolated from soybean debris in both years, and a no-tillage rotation which includes maize or wheat could result in increased disease in these crops. Isolation frequencies of the fungi from cover crops varied with the sampling date, but no consistent patterns could be determined for a particular cover crop or fungal species. This is the first detailed study of survival rates of soybean, maize, and wheat pathogens that overwinter on soybean debris in a no-tillage system.

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