Synthetic Polymers on Water Retention and Pore Distribuition in a Clayey Latosol

Benevenute, Pedro Antônio Namorato; Passos, Lucas Ademir Carvalho; Melo, Laura Beatriz de Melo Batista de Batista; Silva, Érika Andressa da; Oliveira, Geraldo César de

doi:10.5380/rsa.v17i3.50268

Cited by 8 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since the soil water balance was cumulative, in the start of spring, there may have been a soil water deficit, soon met by irrigation. Furthermore, Benevenute et al (2016) claim attention is necessary to avoid errors when managing the soil moisture.…”

Section: Discussionmentioning

confidence: 99%

“…The irrigation water depth (LI) applied was determined by the ETc measured by the lysimeters. Volumetric soil moisture at field capacity (q fc ) considered corresponded to the soil water matric poten-tial Ψ m = 10 kPa, according to Benevenute et al (2016). Current soil moisture (q c ) as a function of Ψ mc (current soil water matric potential) was calculated by mean values of the soil water retention curve, obtained from a tension table and by a Richards extractor, in a laboratory of soil and water quality analyses adjusted by the van Genuchten equation (van Genuchten, 1980):…”

Section: Crop Coefficients Of Forage Cropsmentioning

confidence: 99%

See 1 more Smart Citation

Crop coefficients of tropical forage crops, single cropped and overseeded with black oat and ryegrass

Sanches

Souza

Jesus

et al. 2019

Sci. agric. (Piracicaba, Braz.)

View full text Add to dashboard Cite

Crop coefficient (Kc) is the ratio between crop evapotranspiration (ETc) and reference evapotranspiration (ETo), representing the phenological effects on crop water consumption. Kc is fundamental to estimating ETc by agrometeorological methods. This research study aimed to determine Kc and ETc values for Guinea grass (Megathyrsus maximus cv. Mombaça) and Bermuda grass (Cynodon spp.), both single cropped for one year and overseeded with black oat (Avena strigosa) and ryegrass (Lolium multiflorum) during fall/winter. The experiment in the field comprised four plots, two for each tropical forage, with and without overseeding. At the center of each plot, there was a weighing lysimeter with an automated system for data collection. ETc was measured daily over four seasons following the lysimetric method; ETo was calculated using the Penman-Monteith equation. ETc and ETo values were used to estimate Kc values. The single cropped Guinea grass showed the highest values for ETc, with mean ETc and Kc of 3.99 mm d-1 and 1.07, respectively. The single cropped Bermuda grass showed ETc and Kc values of 3.57 mm d-1 and 0.96, respectively. The results of paired t-testing for Kc showed no significant differences (p = 0.05) between single cropped and intercropped for both Guinea grass and Cynodon spp. During winter, intercropped Guinea grass did not show an ETc significantly higher than single cropped Guinea grass, with mean Kc values 0.98 for intercropped and 1.10 for single cropped. Similarly, Bermuda grass did not show significant differences between mean Kc values for intercropped (1.02) and single cropped (1.00).

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Crop Coefficients Of Forage Cropsmentioning

confidence: 99%

Crop coefficients of tropical forage crops, single cropped and overseeded with black oat and ryegrass

Sanches

Souza

Jesus

et al. 2019

Sci. agric. (Piracicaba, Braz.)

View full text Add to dashboard Cite

show abstract

“…Next, the sensor was inserted in a clayey red latosol with the following composition: 0.65 kg kg −1 clay, 0.21 kg kg −1 silt, and 0.14 kg kg −1 sand; and a second test was carried out to measure its output as a function of small differences in matric potentials. When the water retention curve of this soil was measured for small matric potentials between 1 kPa and 35 kPa, a practically linear behavior was observed [23].…”

Section: Measurement With the Sensor Inserted In The Soilmentioning

confidence: 91%

Autonomous Soil Water Content Sensors Based on Bipolar Transistors Encapsulated in Porous Ceramic Blocks

et al. 2019

View full text Add to dashboard Cite

We present an autonomous sensor to measure soil water content that uses a single heat pulse probe based on a transistor encapsulated in a porous block. The sensor uses a bipolar junction transistor, which performs as both a heating and temperature-sensing element. Since the sensor depends on a porous block to measure the matric potential of the soil, it does not suffer from accuracy problems if the contact between the probe and the soil is not perfect. A prototype of the sensor showed a temperature variation of Δ T = 2.9 ∘ C when the porous ceramic was saturated with water. The sensor presented an almost linear behavior for small changes in the matric potential of a red latosol when tested in the 1-kPa and 35-kPa pressure range, showing a sensitivity of S = 0.015 ∘ C/kPa. The ultra-low power signal conditioning circuit can read the sensor’s temperature with a resolution of approximately 0.02 ∘ C, so the matric potential can be read in increments of at least 1.33 kPa. When powered only by a 2-F supercapacitor from the energy-harvesting system, the interrogation circuit is able to take one soil water content measurement per day, for eleven days.

show abstract

“…The previously established irrigation interval was based on a 70% limit of the water availability factor. The moisture at field capacity (θfc) was considered to be the moisture corresponding to the value of the matrix potential, Ψm = 0.1 bar (Benevenute et al 2016). The values of current moisture (θc) were estimated by means of the soil water retention curve, which was obtained with the aid of a tensor…”

Section: Experimental Site and Foragesmentioning

confidence: 99%

Yield parameters and water productivity of tropical and overseeded winter forages

Sanches¹,

Souza²,

Jesus³

et al. 2020

Int J Innov Educ Res

View full text Add to dashboard Cite

Intensive pasture exploitation with tropical forages is one of the most efficient forms ruminant production. However, the results depends on the knowledge about these forages and the experience in its management. The objective of this work was to evaluate water productivity (WP) and yield parameters of Megathyrsus maximum cv. Mombaça “Guinea grass” and Cynodon spp. “Bermuda grass”, in single culture and overseeded with oats + ryegrass in autumn/winter period. Irrigation management was done considering a depletion factor of 0.3 (70% of the humidity the field capacity). The experimental design was a randomized complete block design with four replications, in which the forages are the treatments with evaluation at the time of the cycles. For all evaluated parameters, the best results were obtained with the Guinea grass in exclusive cultivation. The TFP (Total Forage Productivity) of Guinea grass was superior to Bermuda grass (59.3 and 30.2 Mg ha-1, respectively), in accordance with its average LAI (Leaf area index) values of 4.8 and 2.5, respectively. The most efficient use of water occurred for Guinea grass in exclusive cultivation, and the intercropped crops did not present increases in the WP. In the autumn/winter period, the accumulated TFP of the exclusive crop of Guinea grass was higher than the other crops. However, the SDM of Bermuda grass was higher than the other crops. In winter, the highest LAI occurred in Guinea grass in exclusive cultivation, followed by the overseeded Guinea grass, 4.8 and 4.5, respectively. Consortia did not increase forage yield during the winter. The consortiums did not increase forage yield during the winter.

show abstract

Synthetic Polymers on Water Retention and Pore Distribuition in a Clayey Latosol

Cited by 8 publications

References 10 publications

Crop coefficients of tropical forage crops, single cropped and overseeded with black oat and ryegrass

Crop coefficients of tropical forage crops, single cropped and overseeded with black oat and ryegrass

Autonomous Soil Water Content Sensors Based on Bipolar Transistors Encapsulated in Porous Ceramic Blocks

Yield parameters and water productivity of tropical and overseeded winter forages

Contact Info

Product

Resources

About