Atributos químicos do solo associados à produtividade do trigo em um talhão com diferentes potenciais produtivos

Kramer, Luiz Fernando Machado; Müller, Marcelo Marques Lopes; Tormena, Cássio Antônio; Genú, Aline Marques; Michalovicz, Leandro; Vicensi, Marcelo

doi:10.1590/s0100-06832014000400015

Cited by 7 publications

(6 citation statements)

References 17 publications

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“…Excess rainfall in the winter of 2011 (Figure 1), associated to the greater nitrate levels from N fertilization, and to the greater repulsion of this anion by the soil colloids with liming, may be the cause of the greater Mg 2+ leaching in this treatment (Crusciol et al, 2011). The correlation between wheat grain yield and Mg 2+ levels was significant (r=0.53**) at 0-0.1 m soil depth, which corroborates the observations of Kramer et al (2014) of a positive correlation between wheat grain yields and Mg 2+ levels at 0-0.1 m soil depth. Caires et al (2015) reported linear decreases in Mg 2+ content at the soil surface with liming, and stipulated that increasing amounts of Mg 2+ leached below 0.6 m soil depth, in treatments with 4, 8, and 12 Mg ha -1 of lime, associated with 180 kg ha -1 N.…”

Section: Resultssupporting

confidence: 83%

Occasional soil tillage, liming, and nitrogen fertilization on long-term no-tillage system

Yagi

2018

Pesq. agropec. bras.

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The objective of this work was to evaluate the residual effects of occasional soil tillage in a 17-year-old, no-tillage system, associated with liming and nitrogen fertilization, on the crop yields and chemical properties of a very clayey Oxisol in the South of Brazil. A randomized complete block design in split-split plots was used, with two soil managements (with or without plowing), two liming treatments (with or without the required dose to raise base saturation to 70%), five N doses applied on side-dress (0, 1, 2, 4, and 6 times the recommended amounts), and four replicates. A rotation system was used with corn and soybean in the summer, and with wheat and black oats in the winter. The residual effects of occasional soil tillage in a consolidated no-tillage system do not supplant those of liming applied on soil surface, in periods of water deficit, which subsidizes the recommendation to maintain the system consolidated. Excess N fertilization in no-tillage, with liming applied only on soil surface, may harm wheat yield, acidifying the topsoil and leaching Mg2+ to the subsurface soil layers. Without liming, soil acidification is more intense with N fertilization, which, however, favors the accumulation of organic matter on soil surface in a consolidated no-tillage system.

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Section: Resultssupporting

confidence: 83%

Occasional soil tillage, liming, and nitrogen fertilization on long-term no-tillage system

Yagi

2018

Pesq. agropec. bras.

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“…Since in Brazil and other South American countries NT is used uninterruptedly, there is no periodic soil tillage, the accumulation of crop residues in the topsoil and the addition of lime and fertilizers to the surface intensifies soil stratification over time, leading to the accumulation of organic C and N (Ebeling et al, 2008;Venzke Filho et al, 2008), as well as P, K + , Ca 2+ and Mg 2+ to depths of 0.0-0.10 m (Klein et al, 2007;Spera et al, 2011;Acqua et al, 2013;Kramer et al, 2014). Since the vertical mobility of lime is reduced in NT, the subsurface soil changes to a more acidic environment with higher concentrations of exchangeable aluminum (Al 3+ ) (Raij et al, 1998;Ernani et al, 2001), creating a chemical limitation to root growth.…”

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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“…Kramer et al (2014) also observed a correlation between wheat productivity and calcium and magnesium content in the soil.Productivity presented a negative correlation with sand and aluminum contents and a positive correlation with clay content, corroborating the results found by Rodrigues et al (2012) in a study conducted with corn under no-tillage system. The negative correlation between productivity and aluminum content shows that high aluminum contents decrease productivity.…”

mentioning

confidence: 68%

Soil Attributes and Wheat Performance in a Georeferenced Seed Production Field

et al. 2018

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The aim of this research was to study the linear correlations and spatial distribution between soil attributes and productivity and physiological quality of wheat seeds. Soil samples were collected at georeferenced points in an area of 41 ha with a rectangular grid of 100 × 100 m to determine soil fertility. Grain productivity, number of ears m −2 , protein content, and physiological seed quality were assessed. The results were submitted to Pearson's correlation analysis, descriptive statistics, and geostatistics. Phosphorus content presented a high spatial variability, with a coefficient of variation of 97.79%. Protein content, number of ears, and SMP index presented low values of coefficient of variation, indicating their low spatial variability. Physiological seed quality was not correlated with soil attributes. Wheat productivity showed a strong correlation between calcium and soil organic matter contents, as verified by analyzing the spatial distribution maps. The analysis of the spatial distribution maps of soil nutrients is a tool that can contribute to farmers' decision making in the management of crop fertilization aiming at increasing productivity.

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Atributos químicos do solo associados à produtividade do trigo em um talhão com diferentes potenciais produtivos

Cited by 7 publications

References 17 publications

Occasional soil tillage, liming, and nitrogen fertilization on long-term no-tillage system

Occasional soil tillage, liming, and nitrogen fertilization on long-term no-tillage system

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

Soil Attributes and Wheat Performance in a Georeferenced Seed Production Field

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