Efeito de semeadora com haste sulcadora para ação profunda em solo manejado com plantio direto

Nunes, Márcio Renato; Denardin, J. E.; Faganello, A.; Pauletto, Eloy Antônio; Pinto, Luiz Fernando Spinelli

doi:10.1590/s0100-06832014000200027

Cited by 18 publications

(15 citation statements)

References 31 publications

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“…The our results are in agreement with those obtained by Koakoski et al (2007), wherein the breaker type knife system promoted, on average, a 24.3 % increase in soil porosity compared to the offset double disc system. Increasing the depth of action of the shanks (0.17 m) increases the volume of soil favorable to root growth, due to the reduction of the compacted layer in the planting row (Nunes et al, 2014). These authors found that use of the shank leads to increased Macro and TP and BD and resistance to penetration of the compacted layer in the planting row, corroborating the results found in this study.…”

Section: Discussionsupporting

confidence: 87%

“…The 0.1-0.2 m layer in Experiment 1 and the 0.0-0.1 m layer in experiment 2 stand out mainly because of their higher BD values (Nunes et al, 2014), which resulted in poor aeration porosity (Gubiani et al, 2014;Nunes et al, 2014). This may be related to the fact that, in Experiment 1, the area was used for growing irrigated rice, where decompaction of the soil occurred as deep as 0.07 m, mainly due to the tillage practice of discing (Munareto et al, 2010).…”

Section: Discussionmentioning

confidence: 89%

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Soybean Tillage Systems and Physical Changes in Surface Layers of Two Albaqualf Soils

Sartori

Marchesan

David

et al. 2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:A compacted subsurface soil layer can be a limiting factor for soybean growing, reducing soybean yield. The aim of this study was to evaluate the effect of different tillage systems on the physical properties of two Albaqualf soils of the Central Plains region in the state of Rio Grande do Sul in southern Brazil. Two experiments were conducted: one in Santa Maria, RS, during the 2013/14 and 2014/15 crop seasons, and another in Formigueiro, RS, during the 2013/14 crop season. A randomized block experimental design with four replications was used. The treatments were: sowing using an offset double disc (T1); sowing using a fluted coulter disc (wavy disc with 12 waves) (T2); sowing with a knife runner opener (T3); sowing with a knife runner opener + press wheel mechanism for ground levelling (T4); sowing using a furrow opener upon a raised bed (T5); and chisel plough + sowing using an offset double-disc (T6). In the 2014/15 growing season, the T4 factor was changed using a knife runner opener 0.05 m from the planting row. A smaller reduction in the compacted subsurface soil layer was observed for both T1 and T2, which exhibited high soil bulk density values for the 2013/14 and 2014/15 crop seasons. Furthermore, T3, T5 and T6 led to a reduction in bulk density, and increasing total porosity and macroporosity in the soil, which consequently increased water infiltration, water storage capacity, and crop yield in areas with the presence of a compacted subsurface soil layer.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 89%

Soybean Tillage Systems and Physical Changes in Surface Layers of Two Albaqualf Soils

Sartori

Marchesan

David

et al. 2016

Rev. Bras. Ciênc. Solo

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“…In spite of knowing NT since the 1970s, many farmers now restrict this practice to "direct seeding on crop residues" rather than applying the complete "no-tillage management system" with principles of conservation agriculture. This has affected the soil, resulting in stratified properties; satisfactory chemical conditions tend to be restricted to the topsoil, while compaction increases in the subsurface layers, intensifying the cropping problems resulting from the poor weather conditions in recent years (Denardin et al, 2008;Nunes et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Management strategies originally designed from the fundamentals of NT can minimize or mitigate the problems resulting from the vertical gradient of fertility in the soil; implementing crop diversification, reducing time between sowing and harvesting and the addition of crop residues in a manner compatible with the biological dynamics (Nunes et al, 2014) can all produce good results in the medium or long-term. Phosphogypsum (PG), on the other hand, even if applied to the soil surface, improves the chemical conditions in the soil profile for root growth, especially in deeper layers (Carvalho and Raij, 1997), after a few months (Caires et al, 2001, Rampim et al, 2011.…”

Section: Introductionmentioning

confidence: 99%

Do Rates and Splitting of Phosphogypsum Applications Influence the Soil and Annual Crops in a No-Tillage System?

Vicensi

Müller

Kawakami

et al. 2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:Applications of phosphogypsum (PG) provide nutrients to the soil and reduce Al 3+ activity, favoring soil fertility and root growth, but allow Mg 2+ mobilization through the soil profile, resulting in variations in the PG rate required to achieve the optimum crop yield. This study evaluated the effect of application rates and splitting of PG on soil fertility of a Typic Hapludox, as well as the influence on annual crops under no-tillage. Using a (4 × 3) + 1 factorial structure, the treatments consisted of four PG rates (3, 6, 9, ) and three split applications (P1 = 100 % in 2009; P2 = 50+50 % in 2009 and 2010; P3 = 33+33+33 % in 2009, 2010 and 2011), plus a control without PG. The soil was sampled six months after the last PG application, in stratified layers to a depth of 0.8 m. Corn, wheat and soybean were sown between November 2011 and December 2012, and leaf samples were collected for analysis when at least 50 % of the plants showed reproductive structures. The application of PG increased Ca 2+ concentrations in all sampled soil layers and the soil pH between 0.2 and 0.8 m, and reduced the concentrations of Al 3+ in all layers and of Mg 2+ to a depth of 0.6 m, without any effect of splitting the applications. The soil Ca/Mg ratio increased linearly to a depth of 0.6 m with the rates and were found to be higher in the 0.0-0.1 m layer of the P2 and P3 treatments than without splitting (P1). Sulfur concentrations increased linearly by application rates to a depth of 0.8 m, decreasing in the order P3>P2>P1 to a depth of 0.4 m and were higher in the treatments P3 and P2 than P1 between 0.4-0.6 m, whereas no differences were observed in the 0.6-0.8 m layer. No effect was recorded for K, P and potential acidity (H+Al). The leaf Ca and S concentration increased, while Mg decreased for all crops treated with PG, and there was no effect of splitting the application. The yield response of corn to PG rates was quadratic, with the maximum technical efficiency achieved at 6.38 Mg ha -1 of PG, while wheat yield increased linearly in a growing season with a drought period. Soybean yield was not affected by the PG rate, and splitting had no effect on the yield of any of the crops. Phosphogypsum improved soil fertility in the profile, however, Mg 2+ migrated downwards, regardless of application splitting. Splitting the PG application induced a higher Ca/Mg ratio in the 0.0-0.1 m layer and less S leaching, but did not affect the crop yield. The application rates had no effect on soybean yield, but were beneficial for corn and, especially, for wheat, which was affected by a drought period during growth.

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“…Para a soja, utilizam-se herbicidas com mecanismos de ação diferentes daqueles utilizados no arroz, o que contribui para o controle de plantas daninhas de difícil controle no arroz, especialmente o arroz-vermelho (Missio et al, 2010).…”

Section: Introductionunclassified

Rendimento de grãos de soja em função de sistemas de plantio e irrigação por superfície em Planossolos

Sartori

Marchesan

David

et al. 2015

Pesq. agropec. bras.

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Resumo: O objetivo deste trabalho foi avaliar o efeito de sistemas de plantio e irrigação suplementar em faixas sobre o rendimento de grãos de soja, em áreas com presença de camada compactada próxima à superfície do solo. Dois experimentos foram realizados em blocos ao acaso, em faixas, com quatro repetições, no Estado do Rio Grande do Sul. O experimento 1 foi realizado em Santa Maria, correspondente às safras de 2013/2014 e 2014/2015; e o experimento 2, em Formigueiro, na safra 2013/2014. Os tratamentos consistiram dos fatores A e D. O fator A considerou os seguintes sistemas de plantio: A1, semeadura com discos duplos desencontrados; A2, semeadura com disco ondulado de 12 ondas; A3, semeadura com haste sulcadora; A4, semeadura com haste sulcadora e um mecanismo de acomodação do solo; A5, semeadura em microcamalhão; e A6, escarificação do solo e semeadura com disco duplo desencontrado. O fator D consistiu de tratamentos com ou sem irrigação. Na safra 2014/2015, alterou-se o fator A4 por haste desencontrada a 5 cm da linha de semeadura. O experimento 2 constituiu-se apenas do fator A do experimento 1, sem o tratamento microcamalhão. Os sistemas com escarificação do solo e haste sulcadora são os que proporcionam maior rendimento de grãos. A irrigação realizada em condições de umidade do solo abaixo de 60% da capacidade de campo aumenta o rendimento de grãos.

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Efeito de semeadora com haste sulcadora para ação profunda em solo manejado com plantio direto

Cited by 18 publications

References 31 publications

Soybean Tillage Systems and Physical Changes in Surface Layers of Two Albaqualf Soils

Soybean Tillage Systems and Physical Changes in Surface Layers of Two Albaqualf Soils

Do Rates and Splitting of Phosphogypsum Applications Influence the Soil and Annual Crops in a No-Tillage System?

Rendimento de grãos de soja em função de sistemas de plantio e irrigação por superfície em Planossolos

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