scholarly journals TEMPERATURA DO SOLO EM ÁREAS IRRIGADAS COM DIFERENTES COBERTURAS VEGETAIS

2021 ◽  
Vol 10 (12) ◽  
pp. 1-13
Author(s):  
Kaique Augusto Poltronieri DONATONI ◽  
Lucas Estevam BIANCHO ◽  
Camila Fernandes F. APARECIDO ◽  
Jaqueline Bonfim de CARVALHO

As irrigações suplementares e as cobertura dos solos com palhadas são as práticas de manejo mais utilizadas na agricultura brasileira. O método de irrigação adicional, além de suprir água nas vegetações e elevar a produtividade das culturas, reduz o aquecimento cotidiano na face superior da terra. O objetivo deste experimento é quantizar a temperatura de superfície desnuda com e sem irrigação, perante distintos coberturas vegetais. O ensaio foi realizado em Santa Fé do Sul - SP, com oito tratamentos e 4 repetições, avaliados a 20 cm de altura de cobertura foliar, o T1 = solo desnudo com irrigação, T2 = solo desnudo sem irrigação, T3 = solo com Brachiária decumbens com irrigação, T4 = solo com Brachiária decumbens sem irrigação, T5 = solo com Panicum máximum – Mombaça  com irrigação, T6 = solo com Panicum máximum – Mombaça  sem irrigação, T7 = solo com Capim Tifton 85 com irrigação e T8 = solo com Capim Tifton 85 sem irrigação, com quatro repetições de cada tratamento – utilizando delineamento em blocos casualizados (DBC). O sistema com irrigação proporcionou melhores resultados, amenizando a amplitude das temperatura para os tratamentos, as coberturas vegetais obtiveram menores temperaturas e teores de umidade do que o solo desnudo e, no geral, as coberturas vegetais não se diferenciaram entre si.   SOIL TEMPERATURE IN IRRIGATED AREAS WITH DIFFERENT VEGETATION COVER   ABSTRACT The supplementary irrigation and the soil covered with haystack are the most used management practice in Brazilian agriculture. The additional irrigation method, besides supplying the vegetation with water and increasing productivity in cultures, decreases the everyday heating in the upper surface of the soil. The goal of this study was to measure the temperature, reduce the temperature in the unprotected surface with or without irrigation, before different vegetation cover. The essay was carried out in Santa fé do sul- SP, with eight treatments and 4 repetitions, assessed with 20 cm of leaf cover, T1= unprotected soil with irrigation, T2= unprotected soil without irrigation, T3= soil with Brachiária decumbens with irrigation, T4= soil with Brachiária decumbens without irrigation, T5= soil with Panicum máximum – Mombaça  with irrigation, T6= soil with Capim Tifton 85 without irrigation, with four repetitions in each treatment using randomized block design (RBD). The irrigation system provided the best results, mitigating the amplitude of the temperature for the treatments, the vegetation cover presented lower temperatures and moisture content than the unprotected soil, and in general, vegetation covers don’t differ from each other.   Keywords: Temperature variation. Conservative management. Soil protection.

2012 ◽  
Vol 30 (4) ◽  
pp. 861-870 ◽  
Author(s):  
N.M. Correia ◽  
F.J. Perussi ◽  
L.J.P. Gomes

The aim of this study was to assess the efficacy of S-metolachlor applied in pre-emergence conditions for the control of Brachiaria decumbens, Digitaria horizontalis, and Panicum maximum in sugar cane mechanically harvested without previous burning of the crop (green harvest) with the crop residue either left or not on the soil surface. The experiments were established in the field according to a randomized complete block design with four repetitions in a 7 x 2 split-plot scheme. In the plots, five herbicide treatments were studied (S-metolachlor at 1.44, 1.92, and 2.40 kg ha-1, clomazone at 1.20 kg ha-1, and isoxaflutole at 0.188 kg ha-1), and two control treatments with no herbicide application. In the subplots, the presence or absence of sugar cane crop residue on the soil surface was evaluated. S-metolachlor efficacy was not hampered by either 14 or 20 t ha-1 of sugar cane crop residue on the soil surface. When sugar cane crop residue was covering the soil surface, S-metolachlor at a rate of 1.44 kg ha-1 resulted in weed control similar at their larger rates, where as without the presence of crop residue, S-metolachlor controlled B. decumbens, D. horizontalis, and P. maximum at the rates of 1.92, 1.44, and 1.92 kg ha-1, respectively. The herbicides clomazone and isoxaflutole were effective for the studied species, independently of the crop residue covering the soil surface. S-metolachlor caused no visible injury symptoms to the sugar cane plant. Clomazone and isoxaflutole caused visible injuries to the sugar cane plant. None of the herbicides negatively affected the number of viable culms m² or the culm height and diameter.


2020 ◽  
Vol 11 ◽  
pp. e3303
Author(s):  
Daíse Souza Reis Lima ◽  
Welson Lima Simões ◽  
José Aliçandro Bezerra da Silva ◽  
Magno do Nascimento Amorim ◽  
Alessandra Monteiro Salviano ◽  
...  

The objective of this work was to evaluate physiological and biochemical responses of Pele de sapo melon to different irrigation depths (ID) and bioestimulant rates (BTM) to improve its production efficiency. The experiment was conducted in an experimental field in Juazeiro, BA, Brazil. A randomized block design in split split-plot arrangement was used, with four ID (60, 80, 100, and 120% of crop evapotranspiration – ETc) in the plots; five (BTM) (Stimulate® at 0, 0.6, 1.2, 2.4, and 4.8 L ha-1 applied via irrigation system during the flowering stage and after the fruiting stage) in the subplots; and two crop seasons (hot season, 23 to 39 °C; and cold season, 15 to 30 °C) in the sub-subplots. The plants were under daily drip irrigation and spacing of 2.0 × 0.3 m. The variables evaluated were: gas exchange, water use efficiency, chlorophyll a and b, relative water, sugar, and amino acid contents, and fruit yield. The results showed that the ID of 60% ETc resulted in water deficit, denoted by increases in solute concentrations, whereas the ID of 80% and 100% resulted in plants with good performance for biochemical, physiological, and production parameters in both crop seasons. The hot season, ID of 120% ETc, and BTM of 2.4 L ha-1 are recommended for Pele de sapo melon crops, since they result in the best physiological responses and fruit yields.


Author(s):  
Daiana Jungbluth ◽  
Ana Regina Dahlem Ziech ◽  
Camila Roberta Pereira ◽  
Márcia Cristina Dos Santos ◽  
Patrick Machado

The no-till system has been growing over the years and for this system to be successful, it is essential to maintain permanent vegetation cover over the soil, an adequate crop rotation system with minimal overturning. A strategy for soil protection is to introduce species of cover crops in winter under single or intercropping. The objective was to evaluate the rate of soil cover by intercropping between black oats (Avena strigosa L.) and forage turnip (Raphanus sativus L.) at different sowing densities, as well as the isolated species in terms of soil protection under no-tillage. The study was conducted at the Federal Technological University of Paraná (UTFPR), campus Santa Helena, with a randomized block design, with five treatments and three repetitions. The treatments were: 100% black oats (BO); 100% forage turnip (FT); 75% BO + 25% FT; 50% BO + 50% FT and 25% BO + 75% FT. The cover crops were sown in May 2019. The percentage of soil cover from 21 to 91 days after sowing (DAS) was evaluated using the photographic method, with weekly collection of images in an area delimited by a metallic frame (25 m²), positioned on the ground at two fixed points per plot. The coverage rate quantification was estimated by overlaying a grid with 100 points of intersection over each image. The rate of soil cover by consortia and single crops did not show a statistically significant difference. To 49 days, consortia had coverage equal to or greater than 70%, while for single species, this percentage was reached at 56 DAS and 70 DAS, for BO and FT, respectively. All treatments showed high potential for soil protection and coverage rate from 70 DAS.


2018 ◽  
Vol 16 (2) ◽  
pp. 10
Author(s):  
A T Aryanto ◽  
P DMH Karti ◽  
I Prihantoro

<p>ABSTRAK<br /><br />Pengembangan hijauan membutuhkan pupuk ramah lingkungan. Fungi Mikoriza Arbuskular (FMA) adalah asosiasi yang melibatkan jamur dan akar yang dianggap sebagai pupuk hayati untuk meningkatkan produktivitas tanaman dan toleran dari kondisi lingkungan. Ketersediaan FMA masih jarang, sehingga dibutuhkan produksi massal untuk dapat mendukung pengembangan hijauan. Tujuan dari penelitian ini adalah untuk menghasilkan inokulum AMF menggunakan sistem hidroponik dalam jumlah besar secara efektif. Penelitian ini dibagi menjadi 2 tahap. Rancangan Acak Kelompok Faktorial yang digunakan pada tahap pertama dengan faktor A adalah jenis sistem irigasi (Manual, Drip dan Nutrien Film Technique System (NFT)) dan B adalah larutan nutrisi (AB Mix dan Hyponex Red) dengan Pueraria javanica sebagai tanaman inang. Rancangan Acak Lengkap (RAL) dilakukan pada tahap kedua dengan menggunakan produksi inokulum FMA dari tahap pertama dengan Brachiaria decumbens var Mullato sebagai tanaman inang. Hasil penelitian menunjukkan bahwa interaksi antara sistem NFT dan AB Mix signifikan (P&lt;0,05) menghasilkan bahan kering tajuk, bahan kering akar dan spora paling tinggi. Semua tipe sistem irigasi dan nutrisi menunjukkan infeksi akar&gt;96%. FMA inokulasi di Brachiaria decumbes var Mulato signifikan(P &lt;0,05) pada bahan kering tajuk, kandungan N, kandungan P dan serapan P.</p><p><br />Kata kunci: Brachiaria decumbes, FMA, sistem Drip, sistem NFT, Pueraria javanica,</p><p><br />ABSTRACT</p><p>Forage mass production development requires environmental friendly fertilizer. Arbuscular Mycorrhizal Fungi (AMF) are mutualitic symbioses between plant and fungi that considered as natural biofertilizer with benefit to improve plant productivitity and environment stress tolerance. The availability of AMF is still low, so it takes mass production to be able to support forage development. The aim of the research was to produce AMF inoculum using hydroponic system in large quantities. This research divided into 2 stages. The factorial randomized block design was used for the first stage with A factor was type of irrigation system (Manual, Drip and Nutrient Film Technique System (NFT)) and B was the nutritional solution (AB Mix and Hyponex Red) using Pueraria javanica as host plant. Completely randomized design was conducted for the second stage by using AMF inoculum production from first stage using Brachiariadecumbens var Mullat as host plant. The best result was a combination beetwen NFT system and AB Mix significantly (P&lt;0.05) produce highest shoot dry matter, root dry matter and spore production. All type of irrigation system and nutrition showed root infection &gt;96%. AMF inoculation in Brachiariadecumbes var Mulato was significant different (P&lt;0.05) on shoot dry matter, N content, P content and P uptake.</p><p><br />Keywords: AMF, B. decumbes, Drip system, NFT system, P. javanica,</p>


2018 ◽  
Vol 85 (0) ◽  
Author(s):  
Suzete Fernandes Lima ◽  
Leandro Spíndola Pereira ◽  
Gustavo Dorneles Sousa ◽  
Simonny Araújo Vasconcelo ◽  
Adriano Jakelaitis ◽  
...  

ABSTRACT: The use of herbicide underdoses allows minimizing the competition of grasses on annual crops, enabling simultaneous cultivation. In this context, the objective of this study was to investigate glyphosate underdoses on the suppression of the initial growth of three Panicum maximum cultivars aiming at the integrated cultivation, in addition to the effects of forage species on the incidence and development of weeds. Three field experiments were conducted. The experimental design was a randomized block design with four replications and eight treatments consisting of increasing glyphosate doses (0, 54, 108, 270, 378, 540, 756, and 1,080 g a.e. ha−1). An atrazine dose of 1,200 g a.i. ha−1 was added to each treatment. Plant phytotoxicity assessments were performed at 7, 14, 21, and 28 days after application. At 80 and 125 days after sowing, the assessments of total dry matter production, leaf dry matter, stem dry matter, and leaf to stem ratio were carried out, in addition to density and dry matter production of weed community. Glyphosate underdoses below 215, 65, and 90 g a.e. ha-1 have a potential to be investigated aiming at the management of P. maximum cv. Atlas, P. maximum cv. Mombasa, and P. maximum cv. Tanzania under intercropping. The three forage species are effective in suppressing weeds.


2017 ◽  
Vol 35 (0) ◽  
Author(s):  
A.H.C. ANÉSIO ◽  
M.V. SANTOS ◽  
R.R. SILVEIRA ◽  
E.A. FERREIRA ◽  
T.G.S. BRAZ ◽  
...  

ABSTRACT This study was conducted in order to evaluate the selectivity of signal grass and congo grass, submitted to post-emergence herbicide application. The experiment was conducted under greenhouse conditions, in Diamantina, Minas Gerais state, and it was arranged in a randomized block design, with five replications. Treatments were set in factor scheme (8 x 2) + 2. Eight herbicides (nicosulfuron; clomazone; glyphosate; fluazifop-p-butyl + fomesafen; lactofen; fomesafen; fluazifop-p-butyl and mesotrione) were applied in doses recommended by the manufacturer on two fodder species: Brachiaria decumbens cv. Basilisk (signal grass) and Brachiaria ruziziensis (congo grass); in addition, there were two control samples without herbicide application, for a total of 18 treatments. The evaluated herbicides showed less intoxication on signal grass when compared to congo grass. Nicosulfuron and glyphosate promoted higher intoxication on both species when compared to the other herbicides. Glyphosate, fluazifop-p-butyl + fomesafen, fluazifop-p-butyl, mesotrione and nicosulfuron affected the ratio variable / maximum fluorescence (Fv/Fm) in both species, indicating an effect provided by these herbicides on the electron transport chain. Results demonstrated that signal grass and congo grass have higher susceptibility to glyphosate, fluazifop-p-butyl + fomesafen, fluazifop-p-butyl, mesotrione and nicosulfuron. congo grass shows higher susceptibility to the studied herbicides when compared to signal grass.


2017 ◽  
Vol 38 (3) ◽  
pp. 1427
Author(s):  
Thais Valéria Souza Silva ◽  
Luciano Fernandes Sousa ◽  
Antônio Clementino dos Santos ◽  
Ana Cristina Holanda Ferreira ◽  
Rebeca Rocha Cardoso ◽  
...  

The effects of phosphate and nitrogen fertilization on aspects of forage composition and ruminal fermentation were separately evaluated pre- and post-grazing, in addition to the dry matter intake and weight gain of sheep grazing Panicum maximum cv. Massai under a rotational system on Quartzipsamment soil. The aim was to evaluate the effect of fertilization with different levels of phosphorous (50 and 200 kg P2O5/ha) and nitrogen (100 and 400 kg N/ha) compared to unfertilized control soil. The experiment was conducted at the School of Veterinary Medicine and Animal Science at Universidade Federal do Tocantins – UFT, in a randomized complete block design with four replicates in a factorial 2 × 2 design. The study area consisted of 32 paddocks (301 m²), each of which had previously been sown with Panicum maximum cv. Massai. The experimental area was managed under intermittent stocking with a variable stocking rate. Twenty-eight crossbreed sheep were used for grazing management. Evaluations were made before and after grazing, including forage evaluation and measurement of ruminal degradability and intake (using titanium dioxide as the external marker). Regarding the forage composition, a significant difference (P < 0.05) was observed between the control and fertilizer treatments for neutral detergent fiber (NDF), acid detergent fiber, crude protein, lignin and phosphorous content. Fertilization was found to alter the nutritional quality of Panicum maximum cv. Massai grass. Among the nutritional aspects evaluated, fertilization influenced NDF, grass digestibility and dry matter intake. The forage composition of Massai grass is improved by fertilization with nitrogen at 100 kg N/ha and phosphate up to 50 kg P2O5/ha, which represents a relevant management practice for increasing quantity and quality.


2018 ◽  
Vol 39 (6) ◽  
pp. 2517
Author(s):  
Armindo Neivo Kichel ◽  
Luis Carlos Ferreira de Souza ◽  
Roberto Giolo de Almeida ◽  
José Alexandre Agiova da Costa

This study aimed to assess productivity and nutritional value of the tropical grasses Brachiaria brizantha cv. Piatã, Xaraés, and Marandu, Panicum maximum cv. Mombaça, and B. ruziziensis cv. Kennedy in the interseason of an integrated crop-livestock (ICL) system since alternatives are needed for forage production for animal grazing in Autumn and Winter. The experimental design was a randomized block design in a split-split plot scheme with four replications. The treatments of plots consisted of five grasses, subplots consisted of three cropping systems (monoculture, intercropping with corn and unsuppressed grass, and intercropped with corn and suppressed grass), and sub-subplots consisted of four cutting intervals of grasses (50, 90, 125, and 195 days after emergence - DAE). The experiment was carried out from February to September 2014. Dry matter (DM) productivity, obtained at 195 DAE for the three cropping systems (monoculture grass, unsuppressed and suppressed grass in intercropping), were 18.45, 7.15, and 3.05 t ha?1, respectively, and average crude protein contents of leaf blades of grasses decreased linearly between the cutting intervals of 50 to 195 DAE from 19.95 to 9.70%, respectively. Under integrated systems, the studied grasses showed better yields and nutritional quality when compared to traditional grazing systems. Panicum maximum cv. Mombaça and Brachiaria brizantha cv. Xaraés and Piatã had the highest leaf and crude protein yields when compared to Brachiaria ruziziensis cv. Kennedy and Brachiaria brizantha cv. Marandu. In terms of nutritional value, Brachiaria ruziziensis cv. Kennedy was superior to Mombaça and Xaraés grasses but had lower total dry matter yield. Finally, Xaraés, Piatã and Mombaça grasses are recommended choices ICL systems when fodder grass production is the goal.


Irriga ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 42-52
Author(s):  
Ana Lucia Pereira ◽  
José Aloisio Alves Moreira ◽  
Antonio Evaldo Klar

EFEITO DE NÍVEIS DE COBERTURA DO SOLO SOBRE O MANEJO DA IRRIGAÇÃO DO FEIJOEIRO (Phaseolus vulgaris L.)   Ana Lúcia PereiraAGENCIARURAL - Campo Experimental de Rio Verde, Rua do Ginásio, 554, Centro,CEP 75.901-210- Rio Verde, GOJosé Aloísio Alves MoreiraEmbrapa Arroz e Feijão, Cx. Postal 179, CEP 74001-970 – Goiânia, GOAntônio Evaldo Klar*Dept o  de  Eng. Rural – FCA-UNESP, Cx. Postal 237, CEP 18603-970 – Botucatu, SP*Pesquisador Científico do CNPq   1  RESUMO  Este trabalho teve por objetivo estudar os efeitos da cobertura do solo sobre o manejo da irrigação do feijoeiro (Phaseolus vulgaris L.). Os tratamentos constaram de diferentes níveis de cobertura morta com palhada de capim braquiária (Brachiaria decumbens), obedecendo delineamento experimental de blocos ao acaso com quatro repetições para os seguintes tratamentos: 0% (0 t/ha),  25% (2,25 t/ha),  50% (4,50 t/ha),  75% (6,75 t/ha)  e  100% (9,0 t/ha). O experimento foi conduzido na Embrapa Arroz e Feijão, no município de Santo Antonio de Goiás, GO, a 16° 28’ 00” de latitude sul, 49° 17’00”  de longitude oeste e 823 m de altitude, num Latossolo Vermelho escuro argiloso, durante o período de junho a setembro de 1997. O manejo da irrigação por microaspersão foi realizado utilizando tensiômetro e a curva característica de água no solo, irrigando toda vez que tensão matricial da água do solo atingia 30 kPa. A análise dos resultados mostrou  diminuição do número de irrigações e aumento do turno de rega nos tratamentos onde a cobertura  atingiu mais de 50% da superfície do solo. Os valores médios da tensão da água do solo nos tratamentos com 0,25 e 50% apresentaram maior variação (turno de rega menor). A cobertura do solo propiciou maior eficiência do uso da água.A produção de grãos foi avaliada não havendo diferença de produtividade entre os tratamentos de cobertura morta.  UNITERMOS: Cobertura do solo, Irrigação, Phaseolus vulgaris L.   PEREIRA, A. L.; MOREIRA , J. A. A.; KLAR, A. E.   THE EFFECTS OF MULCH ON  IRRIGATION MANAGEMENT OF COMMON  BEAN (Phaseolus vulgaris L.)   2 ABSTRACT  The aim of this study was to evaluate the effects  of mulch on irrigation management of common bean (Phaseolus vulgaris L.). The randomized block design with four replications was applied on  five mulch rates: 0% (0 t/ha), 25% (2,25 t/ha), 50% (4,5 t/ha), 75% (6,75 t/ha) and 100% (9,0 t/ha).The study was set up at the Experimental Station of Embrapa – CNAF, Santo Antonio de Goias, 16°2’ south, 49° 17’ west and 820 m altitude from June to September, 1997 in a Dark – Red Latosol soil. A microsprinkle irrigation system was used.The results showed: - bean yield was not affected by mulch treatments; - the irrigation number was decreased when  mulch application was higher than 50%.   KEYWORDS: mulch, irrigation, Phaseolus vulgaris L.


Author(s):  
Sumit Mukati ◽  
Y. M. Kool ◽  
Deepak Thakur ◽  
Deepak Singune

Present field experiment was conducted at farmer’s field in Ringondiya village, Madhya Pradesh during rabi season 2018-19 to study the effect of integrated nutrient management practices on performance of chickpea, basic soil properties and nutrient availability. The performance of chickpea (cv. JG-322) was evaluated under seven treatments viz., T1-Control, T2-100% N:P:K (20:50:20), T3-50% N:P:K + FYM @5 t ha-1, T4-50% N:P:K + vermicomposting @2 t ha-1, T5-50% N:P:K + PSB @4 kg ha-1, T6-50% N:P:K + FYM @5 t ha-1 + PSB @4 kg ha-1 and T7-50% N:P:K + vermicomposting @2 t ha-1 +PSB @4 kg ha-1 replicated thrice in a randomized block design. The grain yield, straw yield and harvest index of chickpea were determined at harvest. Similarly, the soil pH, electrical conductivity, soil organic carbon and soil available nutrients (N, P and K) were also determined in post harvest soil samples. The results revealed that the integrated nutrient management practice significantly improved the performance of chickpea. The soil organic carbon and available nutrients were also found increased under INM practices.


Sign in / Sign up

Export Citation Format

Share Document