SOURCES AND DOSES OF POTASSIUM ON YIELD COMPONENTS OF SOYBEAN AND SORGHUM

Para uma boa produtividade agrícola é fundamental que o solo possua a fertilidade adequada, para disponibilizar os nutrientes exigidos pelas culturas. O objetivo do trabalho foi avaliar o efeito das diferentes fontes e doses de potássio sobre os componentes da produção e produtividades na cultura da soja e na safrinha com a cultura do sorgo. O experimento foi instalado na safra 2018/2019 no campo experimental da Universidade Estadual de Goiás, Unidade Universitária de Ipameri, Campus Sul, no município de Ipameri-GO. O delineamento experimental utilizado foi o de blocos casualizados, arranjados em esquema fatorial 2 x 6, sendo duas fontes de potássio (cloreto de potássio e fonolito) e seis doses de potássio (0; 60; 120; 180; 240 e 300 kg ha-1), com quatro repetições e aplicadas via solo utilizando como fonte o cloreto de potássio (58% de K2O) e fonolito (8% de K2O e 25% de Si). O sistema de plantio utilizado foi o sistema de plantio direto, sobre palhada de milho, utilizando a cultivar de soja M 7110 IPRO para cultura da soja e para o sorgo utilizando a cultivar Atlântica MR 43. Foram realizadas as principais avaliações agronômicas para a cultura da soja e para a cultura do sorgo. A adubação potássica favoreceu a produtividade da cultura da soja onde a fonte fonolito apresentou melhor produtividade de grãos até a dose de 300 kg ha-1 de potássio. As doses de potássio influenciaram na produtividade da cultura do sorgo até a doses de 300 kg ha-1 de K.For a high agricultural yield, the soil must have adequate fertility to provide the nutrients required by crops. This study aimed to evaluate the effect of different potassium sources and doses on yield and its components in the soybean and sorghum in the second harvest. The experiment was installed in the 2018/2019 harvest in the experimental field of the State University of Goiás, University Unit of Ipameri, Campus Sul, in Ipameri-GO. The experimental design used was randomized blocks arranged in a 2 x 6 factorial scheme with four replications. Two potassium sources (potassium chloride 58% K2O and phonolite 8% K2O and 25% Si) and six potassium doses (0; 60; 120; 180; 240; and 300 kg ha-1) applied via soil were evaluated. The experiments were carried out under the no-tillage system on corn straw, using the cultivars M 7110 IPRO and Atlântica MR 43 of soybean and sorghum, respectively. The main agronomic evaluations were carried out for the soybean and sorghum. Potassium fertilization favored the soybean grain yield, and the phonolite source showed higher grain yield up to the dose of 300 kg ha-1 of potassium. The potassium doses influenced the grain yield of sorghum up to 300 kg ha-1 of K

Adubação de plantio e doses de nitrogênio em cobertura no milho safrinha

O presente trabalho teve como objetivo avaliar a influência da adubação com formulados na semeadura e doses de nitrogênio em cobertura sobre as características produtivas do milho cultivado na safrinha. O experimento foi conduzido entre os meses de março a junho de 2018, na fazenda da Universidade Estadual de Goiás, Unidade Universitária de Ipameri-GO. O delineamento experimental utilizado foi o de blocos casualizados no esquema fatorial 3 x 5 sendo três formulações de adubos na semeadura (06-22-12; 08-20-15 e 06-22-12 + 2% de carbono orgânico) e cinco doses de N (0, 50, 100, 150 e 200 kg ha-1) em cobertura, com quatro repetições. Determinou-se o teor de nitrogênio foliar, massa fresca e seca de folhas, altura de plantas, diâmetro do colmo, altura de inserção da primeira espiga, comprimento e diâmetro de espigas, massa de mil grãos, massa de plantas por hectare, extração de nitrogênio e produtividade. Diante dos resultados pode-se utilizar indiferentemente os fertilizantes formulados NPK na produção do milho safrinha. As doses de nitrogênio em cobertura apresentam resultados satisfatórios até a dose estimada de 135 kg ha-1 de nitrogênio para o cultivo de milho safrinha.The present study aimed to evaluate the influence of fertilization formulated at planting and doses of nitrogen in topdressing on the yield components of second-crop corn. The experiment was conducted between March and June 2018 on the farm of the State University of Goiás, University Unit of Ipameri-GO. The randomized block design, arranged in a 3 x 5 factorial scheme with four replications, was used. Three fertilizer formulations at planting (06-22-12; 08-20-15 and 06-22-12 + 2% organic carbon) and five doses of N (0, 50, 100, 150 and 200 kg ha-1) in topdressing were evaluated. Leaf nitrogen content, fresh and dry mass of leaves, plant height, stem diameter, first ear insertion height, length and diameter of ears, 1000-grain weight, the mass of plants per hectare, extraction of nitrogen, and grain yield were assessed. Given the results, NPK formulated fertilizers can be used indifferently to grow second-crop corn. Nitrogen doses in topdressing have satisfactory results up to the estimated rate of 135 kg ha-1 for the cultivation of second-crop corn

Efeito da adubação nitrogenada e potássica em pomar de goiabeiras

A resposta da goiabeira à adubação pode ser monitorada por análise de tecido vegetal. A correta interpretação desses dados, com base nos teores-padrão, é de grande importância para o correto manejo nutricional da cultura. No entanto, os teores-padrão são constantemente criticados por não considerarem as interações que ocorrem entre os elementos. Através do exposto, este trabalho teve como objetivo utilizar a análise composicional, com o auxílio das coordenadas ilr, a fim de avaliar a produtividade da cultura, equilíbrio catiônico do solo e melhorar o diagnóstico nutricional da goiabeira ‘Paluma’, em resposta à doses de nitrogênio e potássio em pomar de goiabeiras ‘Paluma’, durante cinco ciclos produtivos consecutivos,em área comercial irrigada, no município de Vista Alegre do Alto – SP, durante cinco ciclos consecutivos, de 2009 a 2012, observando a influência do dos fertilizantes (ureia e cloreto de potássio) e da sazonalidade. Nas plantas observou-se que a adubação nitrogenada alterou significativamente os balanços [N, P, S, | K, Ca, Mg], [N, P| S] médio e [N | P], e a adubação potássica modificou significativamente os balanços [K | Ca, Mg] e [Ca | Mg] médio. Verificou-se que o período de cultivo e a adubação nitrogenada influenciaram na produtividade da goiabeira ‘Paluma’. A produtividade das goiabeiras e seu balanço nutricional permitiram a definição de faixas de balanço nutricional, bem como sua validação, empregando as faixas de teores nutricionais atualmente utilizadas no Brasil. No solo observou-se que a adubação nitrogenada diminuiu os valores do balanço [K, Ca, Mg | H+Al] e, consequentemente, o valor do pH do solo, enquanto a adubação potássica aumentou os valores do balanço [K | Ca, Mg] e, consequentemente, a concentração de K no solo. A dose de 0,55 kg de K2O planta-1 ciclo-1 foi suficiente para manter a concentração de K no...The response of guava plants to fertilization can be monitored by plant tissue analysis. The correct interpretation of these data, based on the standard contents, is of great importance for the culture correct nutritional management. However, the standard contents are constantly criticized for not considering the interactions between elements. This way, this study aimed to use the compositional analysis with the aid of ilr coordinates, in order to assess the crop yield, soil cation balance and improve the nutritional diagnosis of guava 'Paluma', in response to doses of nitrogen and potassium in the orchard of guava 'Paluma' for five consecutive production cycles in commercial irrigated area in Vista Alegre do Alto - SP, for five consecutive cycles, from 2009 to 2012, noting the influence of fertilizer (urea and potassium chloride) and seasonality. In plants it was observed that nitrogen fertilization significantly altered the balance [N, P, S, | K, Ca, Mg], [N, P| S] medium, and [N | P], and potash fertilization significantly altered the balance [K | Ca, Mg] and [Ca | Mg]. We verified that the cultivation period and nitrogen fertilization influenced in ‘Paluma’ guava. The productivity of guava plants and its nutritional balance allowed the definition of nutritional bands as well as its validation by utilizing the nutritional bands content currently used in Brazil. In soil it was observed that nitrogen fertilization decreased balance values [K, Ca, Mg | H+Al] and consequently the soil pH value, potassium fertilization increase balance values [K | Ca, Mg] and, consequently, soil K content. The 0.55 kg K2O plant-1 cycle-1 rate was sufficient to maintain the soil K content over 1.6 mmolc dm-3, at guava plants roll. The values of studied balance suffered influences of soil sample perio

Nitrogen and Potassium Fertilization in a Guava Orchard Evaluated for Five Cycles: Effects on the Plant and on Production

ABSTRACT Guava response to fertilization can be monitored through plant tissue analysis. Correct interpretation of these results, based on standard levels, is of great importance for correct nutrient management of the crop. However, standard levels are constantly criticized for not considering interactions among elements. To improve the nutritional diagnosis of ‘Paluma’ guava (Psidium guajava L., Myrtaceae), an experiment was conducted using nitrogen fertilization (0, 0.5, 1.0, and 2.0 kg per plant per cycle of N, with urea as a source with 45 % N), and potassium fertilization (0, 0.55, 1.1, and 2.2 kg per plant per cycle of K2O, with potassium chloride as a source with 60 % K2O) in an irrigated commercial area for five consecutive cycles, 2009 through 2012, observing the influence of fertilizers and climate and assessing yield and leaf element content, using the concept of isometric log ratios (ilr) to interpret leaf analysis results (N, P, Ca, Mg, K, and S). This paper showed that nutrient balances and nutrient concentration values can be interpreted coherently using compositional data analysis. Ranges of nutrient balances also were established for “Paluma” guava and validated through ranges grounded in nutrient contents currently used in Brazil. Nitrogen fertilization increased “Paluma” guava yield. The 0.5 kg N application rate per plant and the other studied treatments practically showed the same results, and their values were affected by pruning time as well as the nutrient balances

Nitrogen and Potassium Fertilization in a Guava Orchard Evaluated for Five Cycles: Effects on the Plant and on Production

ABSTRACT: Guava response to fertilization can be monitored through plant tissue analysis. Correct interpretation of these results, based on standard levels, is of great importance for correct nutrient management of the crop. However, standard levels are constantly criticized for not considering interactions among elements. To improve the nutritional diagnosis of 'Paluma' guava (Psidium guajava L., Myrtaceae), an experiment was conducted using nitrogen fertilization (0, 0.5, 1.0, and 2.0 kg per plant per cycle of N, with urea as a source with 45 % N), and potassium fertilization (0, 0.55, 1.1, and 2.2 kg per plant per cycle of K 2 O, with potassium chloride as a source with 60 % K 2 O) in an irrigated commercial area for five consecutive cycles, 2009 through 2012, observing the influence of fertilizers and climate and assessing yield and leaf element content, using the concept of isometric log ratios (ilr) to interpret leaf analysis results (N, P, Ca, Mg, K, and S). This paper showed that nutrient balances and nutrient concentration values can be interpreted coherently using compositional data analysis. Ranges of nutrient balances also were established for "Paluma" guava and validated through ranges grounded in nutrient contents currently used in Brazil. Nitrogen fertilization increased "Paluma" guava yield. The 0.5 kg N application rate per plant and the other studied treatments practically showed the same results, and their values were affected by pruning time as well as the nutrient balances