Doses e épocas de aplicação de potássio no desempenho agronômico do milho no cerrado piauiense

Petter, Fabiano André; Andrade, Fabrício Ribeiro; Zuffo, Alan Mário; Monteiro, Marinete Martins de Sousa; Pacheco, Leandro Pereira; Almeida, Fernandes Antônio de

doi:10.14295/cs.v7i3.1218

Cited by 10 publications

(9 citation statements)

References 9 publications

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“…The corn yields in the first crop (2013-14), and the total production of grain at the end of two growing was changed by applying K, being the maximum rate response at 232 kg ha -1 K2O for corn and 252 kg ha -1 of K2O for the accumulated yield. A similar response was reported by Petter et al (2016), but the response was much more restricted, with the maximum yield obtained at a rate of 53 kg ha -1 K2O, where it was lower than this study. The corn crop 2013-14 encountered conditions of low rainfall during development (only 227 mm), when the last significant rain occurred 29 days after sowing, which reduced productivity to 8,190 kg ha -1 , compared to average historical yield of 8,520 kg ha -1 in the last 5 years.…”

Section: Productivitysupporting

confidence: 88%

Fertilization with potassium (K) in the soybean-corn succession affects behavior of plants and in the soil (oxisol)

et al. 2019

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The potassium fertilizer recommendations are almost entirely made by the main culture in the field, without taking into account the predecessor and successor cultures. The nutrients in crop residues represent a reserve for subsequent crops. Therefore, knowledge of the absorption and cycling capacity of nutrient through the culture, and efficient fertilization should consider the entire system are important. This study aimed to evaluate the effect of potassium levels in soybean and corn, changes in nutrient stocks in the soil profile, absorption and accumulation in plant tissues and soybean, corn and Urochloa crop production during the two agricultural years. The study was performed in an oxisol in the cerrado-amazon ecotone, with potassium rates (0, 40, 80, 160 and 320 kg ha-1 K2O). The rates applied in soybean (first crop) and three harvests of residual effect of the applied doses (maize-soybeans-maize) were evaluated. After harvesting the first crop, plots were subdivided (with or without the presence of Urochloa in corn spacing) in order to understand effect of Urochloa to increase the potassium cycling in the system. The grain yield and dry matter of Urochloa, extraction, and export of nutrients and their concentration in the leaf were evaluated. During the experiment, the chemical changes caused in the soil were also evaluated. In the first year, corn yield and the cumulative grain yield of the other crops were increasingly influenced by K2O rates. The rates provided increased K concentration and a decrease in Ca and Mg in plant materials. The Ca and Mg elements showed a decreased trend in the soil influenced by the applied rates of up to 130 days after fertilization. The K showed higher levels influenced by rates even after 619 days. We do not recommend the application of high doses of K due to the large losses caused by leaching.

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Section: Productivitysupporting

confidence: 88%

Fertilization with potassium (K) in the soybean-corn succession affects behavior of plants and in the soil (oxisol)

et al. 2019

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“…and Petter et al (2016) observed a significant influence of the application times of K at maize plant height, corroborating with the results of this study. However,Rabê lo et al (2013) did not verify differences in height of the plants submitted to the potassic doses applied at different fertilization periods.…”

supporting

confidence: 92%

“…According to the analysis of variance, the K doses in the two fertilization periods (seeding and V5 stadium) significantly affected the length spike diameter, number of rows of grains, number of grains per row, grain weight and kernel moisture content ( Figure 5). Petter et al (2016) in their study, found similar results, in which K doses influenced all productivity variables except for the length of spikes.…”

Section: Productivity -Maizesupporting

confidence: 64%

Growth, Gas Exchanges and Maize Productivity Under Potassic Fertilizer Management and Residual Response on Bean

Ribeiro

Neto

Júnior

et al. 2019

JAS

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Potassium (K) is the second nutrient of greater absorption by plants, and it is of fundamental importance for the development of the cultures and acts in the activation of enzymes that participate in the photosynthetic processes. However, there are still doubts about its residual effect on crop succession. Therefore, the objective of the research was to evaluate the effect of K doses on growth, gas exchange and maize yield and its residual effect on bean culture. The experiment was a randomized complete block design, in a 5x2 factorial scheme, totaling 10 treatments, with five K doses (0, 50, 100, 150 and 200 kg ha -1 ) and two fertilization periods (seeding and V5 stadium) in maize plants. Growth parameters, gas exchange and yield were evaluated in maize plants, and growth was evaluated in Bean plants in an experimental area belonging to the Department of Plant Science and Environmental, Federal University of Paraí ba in Northeast Brazil. For the analysis of the data, we performed the analysis of variance, according to the design adopted. Subsequently, the data were submitted to regression analysis, with curve fitting, according to the parameters evaluated. Results revealed that, K fertilization influenced the growth of maize plants in the two fertilization periods (seeding and V5 stadium) at 45 and 75 days after planting, as well as in gas exchange and productivity. Fertilization at the V5 stadium in maize presented higher values compared to fertilization at seeding, in which the dose of 150 kg ha -1 presented the best results at both planting times. In relation to the residual effect of K on bean growth, it was verified that, there was influence of the doses on the growth of plants, in which the dose of 200 kg ha -1 recorded the highest values. The results showed that there is the residual response of K on bean cultivation in succession with maize. For the greater development of maize, it is recommended to use the dose of 150 kg ha -1 at the V5 stage of plants.

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“…Potassium, out of the three nutrients investigated and discussed, has the fewest number of studies focused on nutritional efficiency. Petter et al (2016) reported a higher agronomic efficiency for grain yield when the K was split into two doses, in which 50% of the recommended dose was administered at sowing and the remaining 50% at 30 days post sowing, with a 29% higher value than the treatment used in this work. After this, the treatment with the total dose being applied at 30 days post sowing.…”

Section: Potassium (K)mentioning

confidence: 82%

Agronomic Efficiency of Hybrids of Corn to Nitrogen, Phosphorus and Potassium Targeting Fresh Corn

Resende¹,

Damaso²,

Ávila³

et al. 2019

JAS

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The efficiency and responsiveness agronomic to the main macronutrients is becoming increasingly important due to the risk of supply, since it is a finite resource. In addition, excess fertilizer decreases the quality of water and air. Thus, the objective of this work was to assess the corn hybrids in terms of their efficiency and responsiveness to nitrogen (N), phosphorus (P) and potassium (K), and identify the ones most suitable for fresh consumption, according to the product type and technological level to be adopted by the farmer. The randomized complete block design in a 10 × 3 (hybrids and doses) factorial scheme was adopted for the experiment, with three replications, for two season crops (2013/14 and 2014/15). Ten hybrids (2B512PW, 2B587PW, 2B707PW, 30F35HR, 30F53YH, AG1051, BRS1055, BM3061, P3646H e P3862YH) were used in isolation under low availability (without application) and partial, of N, P and K, in an isolated manner, also evaluated under the recommended dose, aiming at fresh consumption. The most efficient and responsive hybrid must first be identified in isolation, based on the availability it is subjected to and later, by its sale, focused on fresh consumption. The hybrids indicated for low availability (low technological level) were BRS1055 and 30F53YH, with respect to responsiveness or agronomic efficiency, the hybrid P3862YH was the one that presented the best performance and indicated for technological levels of medium to high, considering the classification obtained for the nitrogen, phosphorus, and potassium for production vegetable corn.

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Doses e épocas de aplicação de potássio no desempenho agronômico do milho no cerrado piauiense

Cited by 10 publications

References 9 publications

Fertilization with potassium (K) in the soybean-corn succession affects behavior of plants and in the soil (oxisol)

Fertilization with potassium (K) in the soybean-corn succession affects behavior of plants and in the soil (oxisol)

Growth, Gas Exchanges and Maize Productivity Under Potassic Fertilizer Management and Residual Response on Bean

Agronomic Efficiency of Hybrids of Corn to Nitrogen, Phosphorus and Potassium Targeting Fresh Corn

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