Épocas e métodos de aplicação de nitrogênio em milho cultivado no sistema plantio direto

Pöttker, D.; Wiethölter, S.

doi:10.1590/s0103-84782004000400007

Cited by 16 publications

(1 citation statement)

References 7 publications

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“…Yamada (1996) reports that N deficiency in the initial stage of corn development compromises plant development and reduce the number of ears eggs, thereby reducing production. Further, according Pöttker and Wiethölter (2004), if not limited by other factors, the greater N availability increases the potential of the plant to set greater number and weight of grains per spike. Oliveira and Caires (2003) also reported that the increase in N levels (0 to 120 kg ha -1 ) increased linearly the number of grains per ear (Ŷ = 501.5 + 0.26x), weight of thousand grains (Ŷ = 356.0 + 0.20x) and corn yield (Ŷ = 6595.00 + 15.59x).…”

Section: Discussionmentioning

confidence: 99%

Corn Yield Intercropped With White Clover as Living Mulch

Adami¹,

Modolo²,

Adami³

et al. 2019

JAS

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Brazil southern region edaphoclimatic conditions allow farmers to grow perennial winter legumes. However, at summer, a seasonality occurs in the production of these species allowing the grown of annual crops such as corn. In this way, interference between white clover (Trifolium repens L.) living mulch and corn crop (Zea mays L.) was studied using a clover sward established after one and two growing season in relation to the usual system of corn grown over black oat straw aiming to study the relationships occurring in this intercrop, such as white clover herbicide suppression, competition and its nitrogen effects on corn yield as well as its potential to became perennial after corn harvest. White clover suppression management was established in the main plots and corn nitrogen fertilization (0, 60, 120, 180 kg ha-1) was performed in the subplots (4.2 × 8 m) in a randomized block design with four replications. White clover suppression managements were: (i) partial suppression achieved by mowing the plots at the corn seeding day; (ii) partial suppression achieved by mowing plus chemically broadcast application of 2.4-D; (iii) partial suppression achieved by a chemically broadcast application of glyphosate. Corn grain yields ranged from 3.0 to 12.2 Mg ha-1. Nitrogen input and herbicide management are important elements to reduce white clover competition and increase corn yield. It is possible to manage white clover as living mulch in corn with its full recovery after corn harvest without replanting. Clover with 1 cycle is easier suppressed than perennial clover sward and can be handled in intercropping with corn without affecting grain yield, with ability to resume growth in the next growing season.

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Section: Discussionmentioning

confidence: 99%

Corn Yield Intercropped With White Clover as Living Mulch

Adami¹,

Modolo²,

Adami³

et al. 2019

JAS

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Sources, Rates and Time of Nitrogen Application on Maize Crops under No-Tillage System

Souza

Buzetti

Filho

et al. 2016

Communications in Soil Science and Plant Analysis

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Quantitatively, nitrogen (N) is the foremost nutrient for maize crops (Zea mays L.), but the N source to increase the grain productivity still needs more investigation. Thus, the aim of this experiment was to study sources, rates and time of N application on the crop yield and agronomic characteristics of the maize under no-tillage system. The experiment was carried out during two growing seasons on an Oxisol under the factorial 5 × 3 × 3 scheme with five N rates (0, 50, 100, 150, and 200 kg ha −1) and three sources (ammonium-sulfatenitrate as inhibitor of the nitrification (ASN+I), ammonium sulfate (AS) and urea); we applied them two times with four replicates: first time at the sowing or later under side dressing when the plants had the six leaves stage. In the first year, the sources of N had no influence on the number of grain line /ear (NGLE), grain number/line (GNL), total number of grain/ear (TNFE), biomass of 100 grain, plant height (PH), height of the first ear insertion (AFEI) and stalk diameter, in contrast with the foliar N content and the crop yield. Early fertilization with N at the sowing time can afford applications as well as the total side dressing. The increase of the rates had positive influence on the N foliar content, plant height and 100 grains biomass. The highest productivities were found with rates above the threshold of 150 kg ha −1 , no matter the sources and the fertilization time.

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Management of nitrogen fertilization in maize cultivated in succession to black oats in a temperate climate

et al. 2018

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The objective of this study was to verify early nitrogen (N) fertilization on maize cultivated in succession to black oats. We conducted three experiments, relating to the 2012/13, 2013/14, and 2014/15 growing seasons, at UFSC-Curitibanos, in a randomized complete block experimental design, with four treatments and four replicates. The treatments were N management strategies in which the amount of N applied to maize was split into pre-sowing, at sowing, and topdressing times: (T1) control with no N application; (T2) 2/3 - 1/3 - 0; (T3) 1/3 - 1/3 - 1/3; and (T4) 0 - 1/3 - 2/3. The biometrics and productive potential parameters of the crop were evaluated. Application of N, regardless of the treatment, increased the yield. In 2012/13, there were no significant differences between the ways in which the N application was split, although they produced a higher yield than the control, resulting in a mean yield of 5,008 kg ha-1. In 2013/14, T2 was similar to T3 and T4, resulting in a yield of 9,858 kg ha-1; in 2014/15, T3 and T4 were similar, with a mean yield of 12,466 kg ha-1, while T2 resulted in a lower yield of 10,487 kg ha-1. When 2/3 of the N is applied pre-sowing, it is only effective when it is associated with the occurrence of a drought period at an early developmental stage of the plants. In adequate rainfall conditions, the early application of N fertilization is only effective when combined with a further 1/3 of the amount of N at sowing, and later as a topdressing.

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Épocas e métodos de aplicação de nitrogênio em milho cultivado no sistema plantio direto

Abstract: Timing and methods of nitrogen application for corn under no-tillage

Cited by 16 publications

References 7 publications

Corn Yield Intercropped With White Clover as Living Mulch

Corn Yield Intercropped With White Clover as Living Mulch

Sources, Rates and Time of Nitrogen Application on Maize Crops under No-Tillage System

Management of nitrogen fertilization in maize cultivated in succession to black oats in a temperate climate

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