Resposta de cultivares de arroz de sequeiro ao preparo do solo e à irrigação por aspersão

Arf, Orivaldo; Rodrigues, Ricardo Antônio Ferreira; Sá, Marco Eustáquio de; Crusciol, Carlos Alexandre Costa

doi:10.1590/s0100-204x2001000600004

Cited by 29 publications

(32 citation statements)

References 5 publications

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“…Millet as cover crop provided the highest grain yield (Table 4). Arf et al (2001), Bordin et al (2003), Cazetta et al (2008) and Pacheco (2009) also obtained higher upland rice yield using millet as cover crop. This can be attributed to a better development of upland rice with low nitrate/ammonium ratio, in the first weeks of crop development (Lin et al, 2005;Li et al, 2007;Holzschuh et al, 2009;Poletto et al, 2011;Araújo et al, 2012).…”

Section: Resultsmentioning

confidence: 95%

Ammonium and nitrate in soil and upland rice yield as affected by cover crops and their desiccation time

Nascente

Crusciol

Cobucci

2012

Pesq. agropec. bras.

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-The objective of this work was to evaluate the effect of cover crops and their desiccation times on upland rice yield and on the levels of nitrate and ammonium in a no-tillage soil. The experiment was carried out in a randomized blocks, with split plots and three replicates. Cover crops (plots) were sowed in the offseason (March 2009). In November 2009, at 30, 20, 10 and 0 days before rice sowing (split plots), herbicide was applied on the cover crops (fallow, Panicum maximum, Urochloa ruziziensis, U. brizantha and millet). Straw and soil were sampled (0-10 cm) at the sowing day, and after 7, 14, 21, 28 and 35 days. Straws from millet and fallow were degraded more rapidly and provided the lowest level of nitrate in the soil. Urochloa ruziziensis, U. brizantha and P. maximum produced higher amounts of dry matter, and provided the highest levels of nitrate in the soil. Millet provides the lowest nitrate/ammonium ratio and the highest upland rice yield. Desiccations carried out at 30 and 20 days before sowing had the largest levels of nitrate in the soil at the sowing date. Nitrogen content and forms in the soil are affected by cover crops and their desiccation times.Index terms: Oryza sativa, Panicum maximum, Urochloa brizantha, Urochloa ruziziensis, millet, nitrogen. Amônio e nitrato no solo e produtividade do arroz de terras altas influenciados por plantas de cobertura e suas épocas de dessecaçãoResumo -O objetivo deste trabalho foi avaliar o efeito de plantas de cobertura e de suas épocas de dessecação na produtividade do arroz de terras altas e nos níveis de nitrato e amônio de solo em plantio direto. O experimento foi realizado em blocos ao acaso, com parcelas subdivididas e três repetições. As plantas de cobertura (parcelas) foram semeadas na entressafra (março de 2009). Em novembro de 2009, aos 30, 20, 10 e 0 dias antes da semeadura do arroz (parcelas subdivididas), realizou-se o manejo químico das plantas de cobertura (pousio, Panicum maximum, Urochloa ruziziensis, U. brizantha e milheto). As palhadas e o solo (camada 0-10 cm) foram amostrados no dia da semeadura do arroz e após 7, 14, 21, 28 e 35 dias. As palhas do milheto e do pousio degradaram-se mais rapidamente e proporcionaram os menores níveis de nitrato ao solo. Urochloa ruziziensis, U. brizantha e P. maximum produziram mais matéria seca e proporcionaram os maiores níveis de nitrato no solo. O milheto proporciona menor relação nitrato/amônio no solo e maior produtividade do arroz. A dessecação aos 30 e 20 dias da semeadura do arroz proporciona os maiores níveis de nitrato no solo, na data de plantio. O conteúdo e a forma do nitrogênio no solo são afetados pelas plantas de cobertura e por suas épocas de dessecação.

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Section: Resultsmentioning

confidence: 95%

Ammonium and nitrate in soil and upland rice yield as affected by cover crops and their desiccation time

Nascente

Crusciol

Cobucci

2012

Pesq. agropec. bras.

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“…; P (resina) = 24 mg dm . A precipitação pluviométrica média anual é de 1.370 mm, a temperatura média anual de 23,5ºC e a umidade relativa do ar de 70-80% (Arf et al 2001 A semeadura foi realizada em área anteriormente cultivada com milho e o preparo do solo realizado no mês de abril, por meio de uma aração, seguida de duas gradagens, para nivelamento. A ervilha foi semeada manualmente, no dia 19/04/2005, com sementes previamente tratadas com thiram.…”

Section: Key-wordsunclassified

Doses de zinco e nitrogênio na produtividade e qualidade de grãos de ervilha

Cardoso

Haga

Binotti

et al. 2012

Pesqui. Agropecu. Trop.

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INTRODUÇÃOOriginária do Oriente Médio, a ervilha é muito apreciada em todo o mundo, sendo consumida como grãos verdes ou enlatados (secos reidratados ou verdes). No Brasil, até a década de 1980, o produto era importado, mas, atualmente, a demanda é atendida pela produção nacional. Seu cultivo é efetuado durante o inverno, sendo a planta bastante tolerante a baixas temperaturas (IAC 2009 Zinc and nitrogen doses on pea grains quality and yield Peas present a potential to be cultivated in the winter, in Brazil, and also a great importance, especially in human feeding, due to its high protein content. However, its yield is still low and there are just a few studies aiming at improving pea grains quality and yield. This study aimed at evaluating the nitrogen and zinc fertilization effect on the pea grains (Utrillo cultivar) chemical quality and yield. The experiment was carried out in a dystrophic clayey Latosol-Haplustox, in Selvíria, Mato Grosso do Sul State, Brazil, in 2005. A randomized blocks design was used, in a 4x4 factorial scheme, totaling 16 treatments and 3 replications, including four nitrogen doses (0 kg ha -1 , 60 kg ha -1 , 120 kg ha -1 , and 240 kg ha -1 ), as urea, via ground, at 30 days after sowing (DAS), and four zinc doses (0 kg ha -1 , 1,5 kg ha -1 , 3 kg ha -1 , and 6 kg ha -1 ), as zinc sulphate, via leaf, at 45 DAS. The combination of zinc and nitrogen doses improved the grains chemical quality. Zinc had no effect on grain yield, however, high nitrogen doses negatively affected yield. KEY-WORDS:Pisum sativum L.; carbohydrate; amino acid; protein.

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“…Kamanang and Kadari upland rice landraces (URLs) expressed remarkable germination rate with the onset of complete (100%) germination percentage on the 3 rd and 5 th Days After Sowing (DAS), respectively. When water is limited, rice cycle was prolonged; plant height was reduced [29]. In the current study, the maximum height reached by Kamanang 1 landrace (i.e.…”

Section: Agronomic Performances Of Upland Rice Landracesmentioning

confidence: 50%

Screening for Drought-Tolerant and Low-Input Responsive Upland Rice Landraces

Barba¹,

Marquez²,

Tablizo³

2014

AJPS

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Productivity potentials of upland rice landraces (URLs) are continuously compromised by scanty water supply due to competing priorities for irrigations and fluctuations in agro-ecological conditions peculiar to low-input farming systems. A growing demand for rice amidst decline in productive agricultural areas plunges into an urgent contribution of marginal areas critical in attaining food sufficiency among Filipino households. Agronomic performances of URLs locally found in Catanduanes province, Philippines were evaluated in a replicated trial utilizing three URLs: Kamanang [1], Kadari [2] and Bulaw [3]. The experimental set-up was closely monitored for consistent dry moisture content and zero fertilizer application. Results were significant for traditional upland landraces: Kamanang and Kadari, scored in terms of higher germination rate, increment plant height and the number of tillers during the vegetative stage. Leaf color gradations, although statistically not significant across cultivars, were suggestive of varying adaptive performance between traditional cultivars subjected to low-input system. Putative low-input responsive lines indicated by the higher survival percentage and overall agronomic responses were selected from the study site. Screened lines took part of the advance population which would be potentially able to tolerate poor soil conditions (i.e. poor storehouse of water and nutrients) especially in areas with edaphological constraints and changing rainfall distribution pattern. The development of putative drought tolerant lines among URLs forms the most economical solution implicated to areas with limited access to agricultural interventions.

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Resposta de cultivares de arroz de sequeiro ao preparo do solo e à irrigação por aspersão

Cited by 29 publications

References 5 publications

Ammonium and nitrate in soil and upland rice yield as affected by cover crops and their desiccation time

Ammonium and nitrate in soil and upland rice yield as affected by cover crops and their desiccation time

Doses de zinco e nitrogênio na produtividade e qualidade de grãos de ervilha

Screening for Drought-Tolerant and Low-Input Responsive Upland Rice Landraces

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