Efeitos de épocas e de modos de aplicação do sulfato de amônio- 15N e interação nitrogênio - 15N - fósforo - 32P, na quantidade e teores de N, P, K na planta e na folha do milho, na produção, na quantidade de proteína e eficiência do nitrogênio do fertilizante convertido em proteína

Neptune, André Martin Louis; Campanelli, Antonio

doi:10.1590/s0071-12761980000200030

Cited by 2 publications

(2 citation statements)

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“…However, studying N application timing for corn, Neptune and Campanelli (1980), observed that the higher grain yield was obtained when all of the N was applied at the planting, and the production decreased when the N was applied from 73 to 83 days after the emergency. Even though, reported that the full implementation of N rates at the planting caused higher level of corn dry matter per kg of N than the gain obtained from the N applied as sidedressing.…”

Section: Nitrogen and Other Nutrients: Influence In Maize Grain Produmentioning

confidence: 99%

“…Although it is known that this crop requires about 20 kg ha -1 of N for each ton of produced grain (FANCELLI, 2000;SOUSA;LOBATO, 2004) there is still some controversy about the ideal time for nitrogen application to this crop. Some authors state that the ideal time is to make the application at seeding or close to this time, but others report that it is ideal to apply at the later stages, thus avoiding losses by leaching and volatilization and increasing the efficiency of absorption and the use of the nitrogen fertilizer NEPTUNE;CAMPANELLI, 1980;CANTARELLA, 1993;SÁ, 1996;DA ROS et al, 1999;PAULETTI;COSTA, 2000;CERETTA et al, 2000;CERETTA, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen impacts on maize yield and nutrient use efficiency in contrasting stress environments

Silva¹

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Nitrogen impacts on maize yield and nutrient use efficiency in contrasting stress environments Nitrogen (N) fertilization and drought stress have large influence on maize grain yield, thus studies about genotypes and management technologies are very important to increase maize production. This study is presented in three chapters; the first two were undertaken in the United States of America and the third one in Brazil. The following objectives are addressed in this order: (1) The primary objective was to understand which traits, if any, differ between similar-maturity tolerant and non-drought tolerant hybrids that govern nutrient uptake and concentrations under different management treatments (varied plant densities (PD) and N rates) and their influence on grain yield (GY). (2) The primary objective was to investigate the physiological and yield responses of comparable-maturity drought and nondrought tolerant hybrids (P1151 vs. P1162, and P1498 vs. 33D49) to varied plant density and N rates. (3) The main objective was to investigate the responses of maize to sidedress N applications, using isotopically labeled urea fertilizer (15 N), at different development stages. The secondary objective was to verify the correlations between the chlorophylls and carotenoids with SPAD index (evaluated at V14 and V16) and all these parameters with total biomass (BM), harvest index (HI), GY and grain N content. The major results for objectives 1 and 2 were as follows: All hybrids had similar GY responses to PD (near 79,000 versus near 100,000 plants ha-1) and N rate (from 0 to 269 kg N ha-1) treatment factors. Hybrid 1 (AQUAmax™ P1151) demonstrated similar leaf photosynthetic (A) and transpiration (E) rates than its non-drought tolerant counterpart of similar maturity since Hybrid 2 (P1162) had a higher leaf area Index (LAI) (at the R2 and R3 stages) and a similar GY as Hybrid 1. Hybrid AQUAmax™ P1498 maintained higher leaf A and E rates than P33D49 during the grain-fill period, thus perhaps demonstrating improved persistence in root water uptake late in the season. There was no single trait differentiation in photosynthesis or transpiration between drought and non-drought tolerant hybrids. Highest BM and GY at maturity generally followed shorter anthesis-silking intervals and more stover macronutrient (P and S) accumulation, in the drought season, so these characteristics appeared to be important drought-tolerant mechanisms regardless of hybrid designations. The major findings from the objective 3 investigations: Maize crop responded similarly for GY to timing of sidedress N application. Grain N content from 15 N fertilizer and N uptake and efficiency were greater for early N applications. SPAD values correlated positively with most pigment variables at V16 in both seasons, thus proving that SPAD was an efficient instrument of indirect evaluation of chlorophylls and carotenoids in maize leaves at early stages. Chlorophyll b at V16, sample stage, was positively correlated (P<0.05) with grain N content, GY, and BM, and total chlo...

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Section: Nitrogen and Other Nutrients: Influence In Maize Grain Produmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrogen impacts on maize yield and nutrient use efficiency in contrasting stress environments

Silva¹

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Efeitos de doses não equidistantes de N, P, K nas concentrações destes macronutrientes na folha e na produção do milho (Zea mays L.)

Neptune

Nakagawa

Scotton³

et al. 1982

An. Esc. Super. Agric. Luiz de Queiroz

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Os experimentos foram conduzidos, em um podzólico de Lins e Marília - variação Lins, de textora barrento-arenosa, localizado no Município de Monte Azul Paulista, SP. O híbrido de milho duplo H-6999B foi utilizado. Cada experimento constou de 5 tratamentos e de 4 repetições. Os níveis de nitrogênio foram: 0, 50, 100, 200 e 400 kg/ha, sendo aplicados também90 kg/ha de P²O5 e 50 kg/ha de K2O. Os níveis de fósforo foram: 0,40, 80, I60 e 320 kg/ha de P²O5, sendo aplicados também 100 kg/ha de N e 50 kg/ha de K2O. Os níveis de potássio foram: 0, 25, 50, 100 e 200 kg/ha de K2O, sendo aplicados também 100 kg/ha de N e 90 kg/ha de P²O5. A aplicação tanto das doses de fósforo comodas de nitrogênio fez aumentar a produção de milho, a qual foi da ordem de 3 a 7 vezes superior à média de produção do Estado de São Paulo. A dose econômica e a sua consequente produção, determinadas pelas equações de Mitscherlichr-Pimentel Gomes foram: para o fósforo, de 253 kg/ha de P²O5 correspondente a urna produção de o.877 kg/ha de milho em grão; para o nitrogênio, foi de 228 kg/ha de N correspondente a uma produção de 11.100 kg/ha de milho e para o potássio, foi de 62 kg/ha de K2O correspondente a urna produção de 9-252 kg/ha de milho. Os níveis críticos econômicos, nas folhas, determinados pelas equações de MALAVOLTA & PIMENTEL GOMES (1961) e correspondentes às doses econômicas, foram de: 0,293% de P, de 3,27% de N e de 2,07% de K. A folha escolhida, ou seja, aquela oposta à espiga mais alta, reflete bem o estado nutricional da planta e consequentemente o nível de fertilidade do solo.

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Efeitos de épocas e de modos de aplicação do sulfato de amônio- 15N e interação nitrogênio - 15N - fósforo - 32P, na quantidade e teores de N, P, K na planta e na folha do milho, na produção, na quantidade de proteína e eficiência do nitrogênio do fertilizante convertido em proteína

Cited by 2 publications

References 12 publications

Nitrogen impacts on maize yield and nutrient use efficiency in contrasting stress environments

Nitrogen impacts on maize yield and nutrient use efficiency in contrasting stress environments

Efeitos de doses não equidistantes de N, P, K nas concentrações destes macronutrientes na folha e na produção do milho (Zea mays L.)

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