scholarly journals Tiller density and tillering on Brachiaria brizantha cv. Marandu pastures inoculated with Azospirillum brasilense

2017 ◽  
Vol 69 (4) ◽  
pp. 1039-1046 ◽  
Author(s):  
B.C. Pedreira ◽  
P.L. Barbosa ◽  
L.E.T. Pereira ◽  
M.A. Mombach ◽  
L.F. Domiciano ◽  
...  
Keyword(s):  
Population Density ◽  
Azospirillum Brasilense ◽  
Block Design ◽  
Experimental Period ◽  
N Fertilization ◽  
Appearance Rate ◽  
Randomized Complete Block Design ◽  
Opposite Behavior ◽  
Grass Sward ◽  
Tiller Density

ABSTRACT The objective of this study is to verify the population density and the dynamics of tillering in the Marandu palisade grass sward subjected to nitrogen (N) fertilization strategies, characterized by the N supply via urea or bacterial inoculant (Azospirillum brasilense). The treatments comprised of four nitrogen fertilization strategies: (A) Without fertilization, (B) 80 kg N/ha, (C) inoculant (A. brasilense), and (D) 80 kg N/ha + inoculant, distributed in a randomized complete block design, with three replications. The nitrogen supply strategies were evaluated during six periods: October, November, and December (2012) as well as January, March, and April (2013). The nitrogen dose or inoculant had no effect on the tiller appearance rate (TAR), tiller mortality rate (TMR), tiller survival rate (TSR), or tiller population density (TPD). However, these variables were influenced by the season. The TAR and TSR were higher at the beginning of the experimental period (October) and lower towards the end of the period (March-April), whereas, TMR and TPD exhibited the opposite behavior, with lower values in October and higher from January onward. Neither the nitrogen nor the inoculant influenced the population dynamics of the tillers in Marandu palisade grass.

scholarly journals SOYBEAN CULTIVATION IN A CROP-LIVESTOCK SYSTEM WITH Azospirillum brasilense INOCULATION

2018 ◽  
Vol 31 (1) ◽  
pp. 1-8
Author(s):  
MARCOS DA SILVA BRUM ◽  
THOMAS NEWTON MARTIN ◽  
VINÍCIUS SANTOS DA CUNHA ◽  
LUIZ FERNANDO TELEKEN GRANDO ◽  
ALEX TAGLIAPIETRA SCHONELL
Keyword(s):  
Azospirillum Brasilense ◽  
Block Design ◽  
Experimental Period ◽  
Height Control ◽  
Grain Productivity ◽  
Randomized Complete Block Design ◽  
Grazing Systems ◽  
Soybean Plants ◽  
Santa Maria ◽  
Livestock System

ABSTRACT The objective of this study was to evaluate the phytomorphological parameters of soybean in a crop-livestock system inoculated with Azospirillum brasilense. The experiment was conducted in Santa Maria, Brazil, for two agricultural years (2 Paper extracted from the doctoral thesis of the first author. 012/2013 and 2013/2014) in a randomized complete block design with three replications. In the winter, the black oat and ryegrass pasture was managed with sheep under different grazing systems: (I) - a conventional grazing (CG) system, where the animals remained in the pasture throughout the experimental period without any pasture height control; (II, III, and IV) - systems with post-grazing pasture heights of 10, 20, and 30 cm, respectively; and (NG) - one control without grazing. All treatments received two nitrogen doses (50 and 100 kg ha-1) and inoculation or no inoculation (A. brasilense). The soybean cultivar BMX Potência RR was sown using no-tillage on 16 November 2012 and 1 December 2013. In each plot, seven rows of plants with spacing of 0.45 m were used, and in four rows, the seeds were inoculated with the bacterium A. brasilense. The phytomorphological variables and grain productivity were evaluated. In a croplivestock system, soybean has better productivity when established on black oat and ryegrass pasture managed with post-grazing pasture heights of between 20 and 30 cm. Areas under conventional grazing in the winter led to smaller soybean plants with lower first and last pod heights. Inoculation with A. brasilense should not be used alone in soybean cultivation.

scholarly journals Plantain-Tree Rubber Intercropping Systems Improved Productivity in the Tropical Humid Zone of Ghana, West Africa

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Erasmus Narteh Tetteh ◽  
Eric Owusu Danquah ◽  
Akwasi Adutwum Abunyewa ◽  
Caleb Melenya Ocansey ◽  
Emmanuel Amoah Boakye ◽  
...  
Keyword(s):  
Population Density ◽  
Growth And Development ◽  
Positive Relationship ◽  
Cropping Systems ◽  
Block Design ◽  
Rubber Tree ◽  
Western Region ◽  
Optimum Population ◽  
Randomized Complete Block Design ◽  
Sole Cropping

A three-year field trial was conducted between 2014 and 2017 in the Ellembelle and Jomoro districts of the Western region of Ghana where rubber production is common to determine the optimum population density of plantain when grown in combination with immature rubber tree crops. The trials were arranged in a Randomized Complete Block Design with 3 replications. The treatments were sole rubber, sole plantain, and three intercrops of one row of plantain in between two rows of rubber, two rows of plantain in between two rows of rubber, and three rows of plantain in between two rows of rubber. The rubber clone used was GT1 while the variety of plantain used was false horn. The results showed that population density of plantain had significant effect on the growth of the associated rubber. Growing plantain at closer spacing of 1.5 m under the high-density plantain treatment significantly increased plantain yield compared to the other cropping systems. There was a significant positive relationship between population density of plantain and the rubber tree growth and development. The optimum population density of plantain when intercropped with rubber was 1,666/ha. The study showed intercropping was advantageous over sole cropping for both crops.

scholarly journals Maize productivity in succession to cover crops, nitrogen fertilization and inoculation with Azospirillum brasilense

2019 ◽  
Vol 23 (12) ◽  
pp. 966-971
Author(s):  
Antônio C. dos Santos Júnior ◽  
Marco A. C. de Carvalho ◽  
Oscar M. Yamashita ◽  
Tauan R. Tavanti ◽  
Renan F. R. Tavanti
Keyword(s):  
Cover Crops ◽  
Nitrogen Fertilization ◽  
Azospirillum Brasilense ◽  
Block Design ◽  
Nitrogen Concentration ◽  
Pigeon Pea ◽  
N Fertilization ◽  
Mineral N ◽  
Maize Production ◽  
Maize Productivity

ABSTRACT The use of microorganisms in agriculture such as Azospirillum brasilense and the cultivation of cover crops in the off season, together with nitrogen fertilization, may be interesting alternatives to increase crop yield. The objective of this study was to evaluate the growth, production and nitrogen concentration of maize grown in succession to cover crops and their interactions with A. brasilense inoculation and topdressing mineral N fertilization. The experiment was conducted on Oxisol, in randomized block design in split-split-plot scheme with four repetitions. The plots consisted of four cover crops: jackbean (Canavalia ensiformis), dwarf pigeon pea (Cajanus cajan), crotalaria (Crotalaria spectabilis) and spontaneous vegetation. In the subplots, with or without inoculation of A. brasilense in maize seeds, and in the sub-subplots: with or without topdressing N fertilization. It was verified that jackbean can generate increments of up to 8.3% in grains per ear, 6.9% in length of ear and 15.2% in mass of one hundred grains. Consequently, the grain yield was higher in this treatment (18%). The inoculation with A. brasilense and topdressing N fertilization did not generate significant increments in maize production components, as observed for cover crops.

scholarly journals Effect of Dietary Symbiotic and Acidifier on Growth Performance and Nutrients Digestibility in Growing Pigs Crossbreed

2020 ◽  
Vol 6 (2) ◽  
pp. 51
Author(s):  
Danung Nur Adli ◽  
Osfar Sjofjan
Keyword(s):  
Growth Performance ◽  
Block Design ◽  
Basal Diet ◽  
Experimental Period ◽  
Nutrient Digestibility ◽  
Growing Pigs ◽  
Experimental Unit ◽  
Randomized Complete Block Design ◽  
Dietary Treatments ◽  
Nutrients Digestibility

The aim of this study was to assess the effects of dietary probiotic enhanced liquid acidifier combined with mannan-rich fraction on growth performance, nutrients digestibility in growing pigs. Thirty [(Duroc×Yorkshire)×Landrace] pigs with the average initial BW of 36.75±1.57 kg were allocated into three treatments by a randomized complete block design. There were five pens per treatment with six pigs per pen. Dietary treatments include: 1) CON (basal diet); 2) T1 (basal diet+probiotic 0.1%) and 3) T2 (basal diet+probiotic+mannan rich fraction 0.2%). the data were analyzed as a randomized complete block design using of SAS University Version 4.0. The model included the effects of block (replication) and treatment. Pen served as the experimental unit. During the entire experimental period of 6 weeks, results showed that addition of complex probiotic at the level of 0.2% to diet increased ADG significantly (p<0.05). Also, digestibility of DM and N tended to increase. To sum up, results in this experiment indicated that dietary [(probiotik×acidifier)×mannan-rich-fraction]  supplementation had a positive effect on growing pigs performance and nutrient digestibility

scholarly journals VEGETATIVE GROWTH OF VEGETABLE AMARANTH AS AFFECTED BY NITROGEN FERTILIZATION

HortScience ◽  
1994 ◽  
Vol 29 (7) ◽  
pp. 733c-733
Author(s):  
Wayne F. Whitehead ◽  
Bharat P. Singh
Keyword(s):  
Leaf Area ◽  
Block Design ◽  
N Fertilization ◽  
Optimum Level ◽  
Fresh Weight ◽  
Amaranthus Tricolor ◽  
Randomized Complete Block Design ◽  
Significant Regression ◽  
N Rates ◽  
Successful Production

Influences of nitrogen (N) rate were evaluated on vegetable amaranth. Amaranthus tricolor, grown at uniform populations over two year. The main objective was to determine an optimum level of N fertilization for successful production in middle Georgia. In 1992 and 1993 accession `RRC 241' was planted in randomized complete block design on June 19 and 23, respectively. Four N rates, equally split were evaluated: 0, 45, 90, and 135 kg ha-1. First of the applications were 18 and 13 days post planting for 1992 and 1993, and again when plants were 5 weeks old. Plants were harvested 48 days after planting with green yield, leaf fresh weight. and stem fresh weight collected in both years and leaf area for 1993. In years 1992 and 1993 green yields were 5.3 and 6.5, 10.7 and 9.0. 13.2 and 12.1, and 13.5 and 14.0 Mg ha-1. respectively for the 0, 45, 90, and 135 rates. In both years vegetative components showed significant regression for all treatments. Vegetative response (R2) for green yield in 1992 and 1993 was quadratic (85%) and linear (73%), leaf fresh weight in both years was cubic (63% and 48%), while stem fresh weight response was linear (29%) and cubic (72%). During 1993 leaf area was linear (58%). Non-significance predominantly occurred between the two higher rates for each year and when combined. indicating that 90 kg N ha-1 should provide optimal production of amaranth for the middle Georgia region.

scholarly journals Ratooning Response of Lowland Rice NSIC Rc352 (Oryza sativa L.) to Method of Nitrogen Application

2020 ◽  
Vol 8 (2) ◽  
pp. 63-74
Author(s):  
Dionesio Banoc ◽  
Keyword(s):  
Oryza Sativa L ◽  
Block Design ◽  
N Fertilization ◽  
Lowland Rice ◽  
Ratoon Crop ◽  
N Application ◽  
Area Index ◽  
High Productivity ◽  
Days To Heading ◽  
Randomized Complete Block Design

This study seeks to determine the effect of N fertilization method on ratoon lowland rice performance, to choose a fertilization method that provides high ratooned yield, and to assess its profitability adopting N fertilization method. The experiment lays out in a Randomized Complete Block Design with three replications and five N fertilization methods as treatments. Method of N application significantly affected the number of days to heading and maturity, plant height, leaf area index (LAI), number of productive tillers hill-1, panicle length and weight, number of filled and unfilled grains panicle-1. This method compensates cost of production of growing ratoon crop than those of the main crop. In fact, the highest profit (PhP25,564.80) was obtained in ratooned plants, which received 60 kg ha-1 N basal + 30 kg ha-1 N topdress application (T3) due to higher grain yield. Thereby, this is an appropriate option that provides high productivity and income for the ratoon growers.

scholarly journals Interaction between thidiazuron and Azospirillum brasilense on yield characteristics and productivity of rice

2019 ◽  
Vol 23 (4) ◽  
pp. 244-249 ◽  
Author(s):  
Fernando de S. Buzo ◽  
Lucas M. Garé ◽  
Orivaldo Arf ◽  
José R. Portugal ◽  
Flavia C. Meirelles ◽  
...  
Keyword(s):  
Experimental Design ◽  
Azospirillum Brasilense ◽  
Foliar Application ◽  
Upland Rice ◽  
Block Design ◽  
Rice Cultivar ◽  
Crop Productivity ◽  
Randomized Complete Block Design ◽  
Individual Effects ◽  
Upland Rice Cultivar

ABSTRACT In rice, the use of the bacterium Azospirillum brasilense has shown to be very useful for the crop, being able to increase the final productivity of the same or reduce the need for nitrogen in topdressing. It has recently been noted that there are other regulators that perform other functions, such as thidiazuron (TDZ), a cytokinin-like substance that has been shown to significantly increase upland rice productivity. Thus, the present work aimed to verify the effect of the interaction between the foliar application of A. brasilense and thidiazuron doses applied at the occasion of the tillering of the plants on the productive aspects and crop productivity. The experiment was carried out in the agricultural years of 2015/16 and 2016/17, at the UNESP Teaching, Research and Extension Farm belonging to the Engineering Faculty of Ilha Solteira - UNESP, located in the municipality of Selvíria, MS. The experimental design was a randomized complete block design with a 2 x 4 factorial scheme with four replicates. The treatments were the combination of the presence or absence of A. brasilense foliar application with doses of TDZ (0, 0.5, 1.0 and 1.5 g ha-1) applied to upland rice cultivar BRS Esmeralda. Based on the results obtained for plant height, number of panicles per square meter, total number of grains and fertility of spikelets, mass of 100 grains and grain yield, it was concluded that, in the two agricultural years observed, there were no interaction and individual effects of the foliar application of the bacteria, and of the TDZ doses used at the time of tillering in the BRS Esmeralda cultivar.

scholarly journals Evaluation of Selected Bacillus Thuringiensis Insecticides for Control of Soybean Looper in North Louisiana, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 238-238 ◽  
Author(s):  
Rosanne N. Mascarenhas ◽  
Alan T. Wier ◽  
David J. Boethel ◽  
P. Scott Lingren ◽  
B. Rogers Leonard
Keyword(s):  
Block Design ◽  
Experimental Period ◽  
Compressed Air ◽  
Row Spacing ◽  
Research Station ◽  
Hollow Cone ◽  
Randomized Complete Block Design ◽  
Period Data ◽  
Soybean Looper ◽  
North Louisiana

Abstract A field study was conducted at the Macon Ridge Branch, Northeast Research Station, located near Winnsboro (Franklin Parish), Louisiana, to evaluate the efficacy of several B. thuringiensis insecticides for soybean looper control. Test plots were 50 ft long by 5 rows with a 40 inch row spacing and were arranged in a randomized complete block design with four replications. Insecticides were applied with a tractor and compressed air sprayer calibrated to deliver 10 gpa at 38 psi through TX8 hollow cone nozzles (2 per row). Insecticide treatments were applied to soybeans in the R5 stage of growth (beginning seed) on 25 Aug. Posttreatment counts, consisting of 25 sweeps per plot, were taken with a 15 inch diameter muslin net at 2, 5, and 7 DAT. No rainfall occurred and the plots were not irrigated during the experimental period. Data were analyzed using analysis of variance followed by means separation according to DMRT.

scholarly journals What is the productive potential of digit grass in response to nitrogen fertilization?

2020 ◽  
Vol 16 (8) ◽  
Author(s):  
Pryanka Thuyra Nascimento Fontes ◽  
Douglas Baracho Oliveira Santos ◽  
Jailson Lara Fagundes ◽  
Alfredo Acosta Backes ◽  
Bráulio Maia de Lana Sousa ◽  
...  
Keyword(s):  
Nitrogen Fertilization ◽  
Production Systems ◽  
Morphological Changes ◽  
Accumulation Rate ◽  
Block Design ◽  
Experimental Period ◽  
Yield Potential ◽  
Area Index ◽  
Productive Potential ◽  
Tiller Density

The digit grass is a highly cultivated species in Northeast Brazil, especially in Sergipe and Alagoas. However, research related to the management of fertilization of this specie is incipient. This experiment was carried out to examine the productive potential of digit grass and its morphological changes in response to nitrogen fertilization. The experimental period was from August 2014 to July 2015. Treatments consisted of five levels of nitrogen fertilization (0, 50, 100, 300 and 600 kg ha-1) arranged in a randomized-block design with four replicates. Urea was used as a source of nitrogen. Height, light interception (LI), leaf area index (LAI), total tiller density (TTD), basal tiller density (BTD) and total (TDM), leaf (LDM) and stem dry matter (SDM) accumulations were influenced (P0.05) by the nitrogen doses, fitting a positive quadratic equation. Nitrogen fertilization did not influence (P0.05) dead material accumulation rate or aerial tiller density. Overall, the increasing nitrogen doses culminated in increased canopy height, LI and LAI as a result of the increase in TTD and BTD, which in turn elevated TDM, LDM and SDM. The herbage yield potential of digit grass can be increased with the application of 478 kg N ha-1, enabling its use as an alternative in intensive animal production systems.

scholarly journals Survival and establishment in field of mangaba seedlings transplanted at different ages

2018 ◽  
Vol 9 (1) ◽  
pp. 102-107
Author(s):  
Marcos Paulo dos Santos ◽  
Ana Paula Silva Siqueira ◽  
Lismaíra Gonçalves Caixeta Garcia ◽  
Luís Henrique Costa Vasconcelos ◽  
Eli Regina Barboza de Souza
Keyword(s):  
Plant Height ◽  
Lower Cost ◽  
Seedling Survival ◽  
Block Design ◽  
Genotypic Diversity ◽  
Experimental Period ◽  
Randomized Complete Block Design ◽  
Destructive Analysis ◽  
Different Ages ◽  
Hancornia Speciosa

The propagation of mangaba (Hancornia speciosa Gomes) occurs mainly by seeds, a lower cost method that guarantees genotypic diversity. The great barrier is the lack of knowledge of the proper transplanting time of these seedlings. This way, the objective of this study was to evaluate the development of mangaba seedlings transplanted at different ages during the summer in Goiânia, Brazil. A randomized complete block design was used in a 2x4 factorial arrangement, with two mangaba subspecies (gardneri and cuiabenses) and four transplanting ages [45, 60, 75 and 90 days after sowing (DAS)], with four replications. Before transplanting, a destructive analysis was carried out on three plants of each subspecies to determine the biometric characteristics as a function of seedling age. The field evaluations initiated at120 DAS, evaluating monthly the seedling survival (%), plant height, stem diameter and number of live leaves per plant until 210 DAS. The biometric characteristics were not affected by the mangaba subspecies. The plant survival decreased linearly throughout the experimental period, regardless of the subspecies. The interaction age transplanting x DAS showed that at 210 DAS the seedlings transplanted later presented greater growth in height and number of live leaves. Regardless of the subspecies, the mangaba presents limitations for establishment in the field, and it is recommended the transplantio of seedlings with 90 days of age.

Sign in / Sign up

Export Citation Format

Share Document