Duração do teste de germinação do capim-tanzânia

ABSTRACT:The available research concerning the processing of grass seeds is scarce, despite its fundamental importance for national and international agribusiness. The objective of this project was to evaluate the effects of processing phases on the physical and physiological quality of tanzania grass seeds for commercialization purposes. Seeds were sampled before processing and after leaving the air and screen machine (upper and intermediate screens and bottom); first gravity table (drift, upper and intermediate spouts); treating machine; second gravity table (upper, intermediate, and lower spouts). Seeds were evaluated as to water content, physical quality (purity and 1,000 seeds weight) and physiological (germination, first count of germination, seedling vigor rating, seedlings length of primary roots and shoots, seedling emergence in the field, and emergence speed index). The processing of Tanzania grass seeds in the air screen cleaner machine and gravity table are efficient to improve the physical quality of the lot. The seed treatment with dye ink reduces the seedlings emergence speed in the field. The processing is not required to meet the national commercialization standards of the Tanzania grass seeds, but for the international.

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“…It was considered germinated the normal seedlings present at the 28 th day after sowing (BRASIL, 2009;TOMAZ et al, 2010).…”

Section: Methodsmentioning

confidence: 99%

Processing in the Quality of Tanzania Grass Seeds

et al. 2016

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“…Nonlinear Logistic and Gompertz models are suitable for the description of seed germination, since they estimate the maximum percentage of accumulated germination (GASPAR-OLIVEIRA et al, 2008;TOMAZ et al, 2010), the time and the speed to achieve the maximum germination potential and have good fi t.…”

mentioning

confidence: 99%

Fitting nonlinear autoregressive models to describe coffee seed germination

Sousa

Neto

Muniz³

et al. 2014

Cienc. Rural

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“…Possibly, this was because temperature variations decrease with straw increasing straw amounts in the soil (Figure 1), as this species requires high alternating temperatures for germination (TOMAZ et al, 2010).…”

Section: Panicum Maximummentioning

confidence: 99%

“…Quiescence and germination of weed are directly affected by these factors (CORREIA; DURIGAN, 2004;SALVADOR, 2007;TOMAZ et al, 2010). (FLECK et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Effects of sugarcane straw on grass weeds emergence under field conditions

Silva¹,

Martins²,

Martins³

2016

Biosci. J.

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ABSTRACT:This study aimed to assess the effects of sugarcane straw soil cover on Brachiaria plantaginea, Panicum maximum and Digitaria nuda seedlings emergence. The experiment was carried out in a soil classified as Red Nitosol. Seven different amounts of sugarcane straw soil cover were assessed (0, 3, 6, 9, 12, 15 and 18 ha -1 ). SP83-2847 variety straw was used. The experiment was arranged in a randomized blocks design, with four replications. Each experimental unit contained three species, which were allocated in the center of each plot, sown at 1 cm depth in a demarcated area. Different amounts of straw were distributed in this area. The sowing rate was used in order to obtain 1200 plant m -2 . Two phases comprised the study. In the first phase, weeds emerged in sugarcane straw cover soil were assessed at 9, 12, 19, 34 and 43 days after sowing (DAS) and the second phase assessed plant emergence after straw removal, at 89, 130, 175, 196, 217 and 234 DAS. Seedlings that had over 1 cm shoot and were visible in all assessments were considered emerged. Soil cover sugarcane straw amount influenced the different species germination dynamics. In the first phase, species differential response was observed regarding used straw amount. In the second phase, after straw removal, there was higher germination for B. plantaginea and D. nuda, while P. maximum showed lower emergency, regardless of the used straw amount.

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Duração do teste de germinação do capim-tanzânia

Cited by 18 publications

References 11 publications

Processing in the Quality of Tanzania Grass Seeds

Processing in the Quality of Tanzania Grass Seeds

Fitting nonlinear autoregressive models to describe coffee seed germination

Effects of sugarcane straw on grass weeds emergence under field conditions

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