Sweet cassavais cultivatedthroughout Brazil, but needs to be better studied in the Cerrado region that has potential for its cultivation. The objective of this work was to evaluate the performanceof sweet cassava cultivars in Cerrado soil duringtwo growing season.The experiments were carried in 2016-2017 and 2017-2018with six cultivars, in Jataí-GO. The experimental design was factorial scheme 6 x 2,being 6cultivarsand two growing season, with three replications.The following evaluations were carried out: number of stems, stem diameter, height of the first branch, height of plants, number of roots per plant, length of roots, diameter of roots, weight of fresh roots, weight of fresh roots, weight of fresh shoots, harvest index and cooking time. The cultivar BRS 399 hadbetter root yield in the two crop years.The cultivars BRS 399, BRS 400, BRS 401 and IAC 576/70 increased the plant shoot weightfrom the first to the second growing season.The harvest index of cultivars BRS 400 and BRS 401 decreased from the first to the second growing season.It was concluded that the cultivars BRS 397, BRS 398, BRS 399 and IAC 576/70 presented the best agronomic performance in the 2016/2017 growing season, in turn, in the growing season2017/2018, the cultivars BRS 397, BRS 399 and BRS400 presented the best results. The cultivars BRS-397 and BRS-399 showed more stable agronomic behavior than the others.
In assessing the quality of seed lots, the vigor tests are complementary to the germination test and they identify differences in the degree of deterioration of the lots. For safflower, there is little information regarding these tests. In this way, the intention of this study was to adapt the accelerated aging test methodology to assess the physiological potential of safflower seeds (Carthamus tinctorius). For this purpose, 12 seed lots were evaluated for thousand-seed weight, germination, first germination count, seedling emergence test (emergence percentage, emergence speed index, relative emergence frequency and the initial, final and mean times) and accelerated aging. For the accelerated aging test, the traditional and saline methods were used. For this, the samples were conditioned in periods of 0, 8, 16, 24, 32 and 48 hours at 42 °C. Afterwards, they were submitted to the germination test, with evaluation of normal seedlings on the 3rd day. The 12 lots were evaluated within each period, in independent experiments. The data were submitted to analysis of variance and the means were compared using the Scott-Knott clustering method at 5% probability. In the traditional accelerated aging test the periods of 16, 24, 32 and 48 hours were more efficient in differentiating the lots in vigor levels, as they stratified the lots in three classes and the time of 8 hour classified the lots in two levels of vigor. In the accelerated saline aging method the time 32 hours were more efficient since it ranked seed lots at three levels of vigor and the periods of 8, 16 and 24 hour stratified the lots in two levels. In results obtained by the principal component analysis it was verified. The variables traditional accelerated aging for 24 and 32 hours correlated with emergence in the field. Therefore, the traditional accelerated aging test at 42 °C for 24 hours are promising for evaluating the physiological quality of safflower seeds.
In evaluating the quality of seed lots, vigor tests are complementary to the germination test, identifying differences in their degree of deterioration. However, for safflower seeds (Carthamus tinctorius L.) there is little information regarding these tests. Thus, the objective was to adapt the cold test methodology to evaluate the vigor of safflower seeds. For that, twelve lots were initially characterized by moisture content, mass of one thousand seeds, germination and seedling emergence in the field. After characterization the samples were conditioned in transparent plastic boxes on paper moistened with water and kept at 10 °C for the periods of 0, 3, 5 and 7 days. After the conditioning periods the samples were transferred to a germination chamber at 25 ºC, with evaluation of normal seedlings on the 3rd day. The obtained data was subjected to variation analysis and when significant, compared by the Scott-Knott method at 5% probability. To verify the efficiency of the methodologies, the principal component analysis was performed. The cold testing at 10 °C for 7 days is recommended for evaluating the physiological quality of safflower seeds.
This study aimed to evaluate the production of twelve crisp head lettuce cultivars (Solaris, SVR 2005, Vera, Vanda, Invicta, Cristal, Alcione, Caipira, Camila, Thais, Brida and Bruna) in a hydroponic cultivation system. The experiment was conducted in a protected environment under red screen (ChromatiNet® Leno). The characteristics analyzed were: total and commercial fresh mass, stem and root fresh mass, stem length and diameter and total number of leaves. All evaluated cultivars reached the commercial weight for the market in natura, with Brida and Bruna cultivars showing higher total and commercial fresh mass.
Nitrogen fertilization is an important management practice in grasses and quite complex, due to the different factors that influence such as climatic conditions, cropping systems, rates and available sources. The objective of this work was to evaluate the different rates of side dressing nitrogen and the effect of the trinexapac-ethyl on wheat (Triticum aestivumL.).The experiment was a randomized block design in a 5x2 factorial scheme, with 4 replicates. The treatments were composed of five nitrogen rates applied in side dressing(0, 20, 40, 80 and 160 kg ha-1of N) and two rates ofetil-trinexapac (0 e 100 g ha-1do active ingredient)in the wheat crop.The following variables were evaluated: shoot dry matter, plant height, flag leaf height, ear insertion height, distance of source and drain, ear length, number of ears per square meter, number of spikelets per ear, fertility of spikelets, number of grains per ear, number of grains per spikelet, mass of one thousand grains, grain yield), hectoliter weight, and grain protein. The growth regulator changes the morphological components of wheat, but does not alter the productive components and yield of grains, not justifying their use under the conditions under which the study took place. Nitrogen fertilization does not alter the morphological components of wheat plants, but increases the number of ears per m2up to a rate of 52 kg ha-1of N, reflecting the increase in productivity up to the rate of 59 kg ha-1.
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