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Registros recuperados: 13
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Changes in Soil Organic Carbon and Nitrogen Stocks in Long-Term Experiments in Southern Brazil Simulated with Century 4.5 Rev. Bras. Ciênc. Solo
Weber,Mirla Andrade; Mielniczuk,João; Tornquist,Carlos Gustavo.
ABSTRACT The Century model has successfully simulated soil organic matter dynamics in many agroecosystems. However, initial applications in southern Brazil produced mixed results. The objective of this study was to calibrate and validate Century 4.5 to simulate soil carbon (C) and nitrogen (N) dynamics under diverse soil management practices in subtropical Brazil. Soil C and N data from two long-term experiments established on a degraded Acrisol in the early 1980s were used. Treatments were conventional or no-tillage; grass or grass/legume cropping systems; and corn with or without mineral N fertilizer. The calibration process iteratively modified model parameters to match simulated values of C additions and Soil Organic Carbon (SOC) and Soil Organic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cover crop; Carbon storage in soil; Soil tillage; Soil organic matter.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100519
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Effects of early compost application on no-till organic soybean Planta Daninha
Penha,L.A.O.; Khatounian,C.A.; Fonseca,I.C.B.
Weed control has always been an important issue in agriculture. With the advent of no-till systems, soil erosion was reduced but herbicide use was increased. Organic no-till systems try to adjust reduced erosion to the no use of herbicides. Nevertheless, this adjustment is limited by the cost of mechanical weed control. This cost may be reduced by improved cultural weed control with cover crops mulches. In this paper we report a study on the application of compost manure on an oats winter cover crop, preceding soybean, instead of on the soybean summer crop. Treatments comprised a control without compost manure, and compost manure doses of 4 and 8 Mg ha-1 applied either on oats in winter or soybean in summer, organized in a randomized block design, with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Euphorbia heterophylla; Oats; Avena spp.; Weed; Cover crop; Manure.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000100001
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Effects of soil water depletion on the water relations in tropical kudzu PAB
Pereira-Netto,Adaucto Bellarmino de; Magalhães,Antonio Celso Novaes de; Pinto,Hilton Silveira.
Tropical kudzu (Pueraria phaseoloides (Roxb.) Benth., Leguminosae: Faboideae) is native to the humid Southeastern Asia. Tropical kudzu has potential as a cover crop in regions subjected to dryness. The objective of this paper was to evaluate the effect of soil water depletion on leaflet relative water content (RWC), stomatal conductance (g) and temperature (T L) in tropical kudzu. RWC of waterstressed plants dropped from 96 to 78%, following a reduction in SWC from 0.25 to 0.17 g (H2O).g (dry soil)-1.Stomatal conductance of stressed plants decreased from 221 to 98 mmol.m-2.s-1, following the reduction in soil water content (SWC). The day after re-irrigation, g of water stressed plants was 15% lower than g of unstressed plants. Differences in T L between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cover crop; Ecophysiology; Forage; Leguminosae; Pueraria phaseoloides; Water deficit.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000700006
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Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis Horticultura Brasileira
Oliveira,Izabela Regina C de; Rezende,Marcelo T; Dias,Carlos Tadeu dos S; Gomes,Daniela de S; Botrel,Élberis P; Gomes,Luiz Antônio A.
In many agricultural experiments the variables are biologically correlated and it is inappropriate to study them only under univariate analysis. Therefore, we evaluated commercial characteristics of crisphead lettuce cultivars and covers under a multivariate approach, using canonical discriminant analysis. We used a split plot design and we tested the cover crop, cultivar and interaction effects by using MANOVA (α= 5%). Means and its standard errors were obtained for average total weight, weight of the head, volume and density of plants. Canonical discriminant analyses were performed using PROC CANDISC procedure in SAS (SAS Institute, 2008) system. Canonical plots were obtained using JMP 9.0 (SAS Institute, 2010) linked to SAS database. With these plots it...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lactuca sativa; Cover crop; Multivariate analysis; Organic production.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362013000300015
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Fertilization and cover crop effects on soil nitrogen and plant nutrition in a young guarana plantation Acta Amazonica
Trujillo,Lucerina; Lehmann,Johannes; Cravo,Manoel da Silva; Atroch,André Luiz; Nascimento Filho,Firmino José do.
Fruit tree production is gaining an increasing importance in the central Amazon and elsewhere in the humid tropics, but very little is known about the nutrient dynamics in the soil-plant system. The present study quantified the effects of fertilization and cover cropping with a legume (Pueraria phaseoloides (Roxb.) Benth.) on soil nitrogen (N) dynamics and plant nutrition in a young guarana plantation (Paullinia cupana Kunth. (H.B. and K.) var. sorbilis (Mart.) Ducke) on a highly weathered Xanthic Ferralsol. Large subsoil nitrate (NO3-) accumulation at 0.3-3 m below the guarana plantation indicated N leaching from the topsoil. The NO3- contents to a depth of 2 m were 2.4 times greater between the trees than underneath unfertilized trees (P<0.05). The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Acid tropical soil; Cover crop; Brazilian Amazon; Fruit tree; Nitrogen leaching.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000400001
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Inhibiton of Yellow Nutsedge (Cyperus esculentus L.) and Bermudagrass (Cynodon dactylon (L.) Pers) by a Mulch Derived from Rye (Secale cereale L.) in grapevines Chilean J. Agric. Res.
Ormeño-Núñez,Juan; Pino-Rojas,Gerardo  ; Garfe-Vergara,Farouk.
Two field trials (Los Andes 1998-1999 and Santiago 2004-2005) were carried out to determine growth inhibition of yellow nutsedge (Cyperus esculentus L.) and bermudagrass (Cynodon dactylon (L.) Pers.), growing on the plantation row, by mulch derived from a rye (Secale cereale L.) cover crop established between grapevine (Vitis vinifera L.) rows on overhead (cv. Flame Seedless) and vertical (cv. Cabernet Sauvignon) training. Spring mowing of the rye sown in the fall allowed for developing a thick and long lasting mulch along the grape rows. Nutsedge and bermudagrass control was 81 and 82%, respectively, and was more effective than conventional chemical (in the row) + mechanical (between rows) control. Glyphosate at 2% for nutsedge and 1% for bermudagrass...
Tipo: Journal article Palavras-chave: Mulch; Cover crop; Rye; Grapevines.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000300003
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Optimal plot size for experiments with black oats and the common vetch Ciência Rural
Cargnelutti Filho,Alberto; Souza,Jéssica Maronez de; Pezzini,Rafael Vieira; Neu,Ismael Mario Marcio; Silveira,Daniela Lixinski; Procedi,Andréia.
ABSTRACT: The aim of this study was to determine the optimal plot size for evaluating the fresh weight of black oats (Avena strigosa Schreb) and the common vetch (Vicia sativa L.) in scenarios comprising combinations of the number of treatments, number of replications and levels of precision. Fifteen uniformity trials were conducted with single-crop and intercropped black oats and vetch. Fresh weight was evaluated in 540 basic experimental units (BEU), each of 1 m × 1 m (36 BEU per trial). The Smith index of soil heterogeneity (1938) was estimated. Plot size was determined using the HATHEWAY method (1961), in scenarios comprising combinations of i treatments (i = 5, 10, 15 and 20), r replications (r = 3, 4, 5, 6, 7 and 8) and d levels of precision (d = 2%,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Avena strigosa; Cover crop; Experimental design; Uniformity trial; Vicia sativa.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000300203
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Organic polyculture of passion fruit, pineapple, corn and cassava: the influence of green manure and distance between espaliers Ciência e Agrotecnologia
Araújo Neto,Sebastião Elviro de; Campos,Pedro Arruda; Tavella,Leonardo Barreto; Solino,Antônio Jussier da Silva; Silva,Irene Ferro da.
The organic fruit crop should incorporate the principles of sustainable agriculture, with a guarantee of productivity coupled with ecological diversity, using techniques of policultive with regional species. The aim of the study was to evaluate the effect of the green manure crops [Canavalia ensiformis (jack beans), Crotalaria spectabilis (sunn hemp), Pueraria phaseoloides (tropical kudzu), Arachis pintoi (peanut forage) and spontaneous plants] and distance between espaliers on the yields of Passiflora edulis f. flavicarpa (passion fruit), Ananas comosus (pineapple), Zea mays (maize), Manihot esculenta (cassava) and biomass in organic polyculture in the state of Acre, Brazil. The randomized block design experiment comprised plots encompassing the space...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic intercropping; Cover crop; Yield; Land-use efficiency.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000300004
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Phosphorus utilization by corn as affected by green manure, nitrogen and phosphorus fertilizers PAB
Silva,Edson Cabral da; Muraoka,Takashi; Franzini,Vinícius Ide; Villanueva,Felipe Carlos Alvarez; Buzetti,Salatiér; Moreti,Dolorice.
The objective of this work was to evaluate the utilization by corn plants of P from triple superphosphate fertilizer labeled with 32P (32P‑TSP), and of P from soil as affected by N rates and by the green manures (GM) sunn hemp (Crotalaria juncea) and millet (Pennisetum glaucum). The experiment was carried out using pots filled with 5 kg Oxisol (Rhodic Hapludox). A completely randomized design was used, in a 4x4x2 factorial arrangement, with four replicates. The treatments were: four P rates as TSP (0, 0.175, 0.350, and 0.700 g P per pot); four N rates as urea (0, 0.75, 1.50, and 2.25 g N per pot); and sunn hemp or millet as green manure. The additions of N and P by the GM were taken into account. After grain physiologic maturation, corn dry matter, P...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Cover crop; Isotopic dilution; Oxisol; Radioisotope; Urea.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000800016
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Plant residues: short term effect on sulphate, borate, zinc and copper adsorption by an acid oxisol BABT
Dias,Ana Cristi Basile; Pavan,Marcos Antonio; Miyazawa,Mário; Zocoler,Décio Carlos.
Laboratory experiments were carried out to examine the effects of plant residues on Cu, Zn, B and S adsorption by an acidic oxisol. The plant residues were: black oats (Avena strigosa), oil seed radish(Raphanus sativus), velvet beans (Stizolobium cinereum), and pigeon pea (Cajanus cajan) collected at flowering stage. Plant residues increased Cu and Zn adsorptions and decreased B and S adsorptions. The results indicated that for short term effect plant residues decreased the availabilities of Cu and Zn through metal organic complex reactions and increased availabilities of S and B through competition with organic anions by the adsorption sites on soil.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Green manure; Cover crop; Micronutrient; Soil sorption.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000200010
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Trial cultivation of Chinese artichoke (Stachys sieboldii Miq.) in Tokachi region OAK
秋本, 正博; 市川, 直子; AKIMOTO, Masahiro; ICHIKAWA, Naoko.
シソ科の塊茎作物であるチョロギ(Stachys sieboldii)の十勝地方における栽培適性を評価した。帯広畜産大学の実験圃場に 4つの試験区を作り、それぞれを本州における慣行栽培に従う「対照区」、土壌をビニルマルチで被覆する「ビニルマルチ区」、そしてリビングマルチとしてオオムギ、あるいはヘアリーベッチを混作する「オオムギ区」と「ベッチ区」とした。2012年5月31日に、チョロギの苗をそれぞれの区に移植し栽培を開始した。そして収穫後の11月に稔った塊茎の収量を試験区間で比較した。チョロギでは使用認可を得た除草剤がないため、栽培期間中の雑草との競合が問題となった。対照区とオオムギ区、ベッチ区では、栽培開始後まもなく雑草との競合が起こり、生育盛期には株が雑草で覆い尽くされてしまった。5月末からのチョロギ栽培では、リビングマルチによる雑草防除効果が期待できないことがわかる。一方、ビニルマルチ区では効果的に雑草が防除され、チョロギ株が旺盛に生育した。対照区の塊茎収量は、459.2±131.8g/㎡であった。本州における平均塊茎収量が300〜600g/㎡であることから、慣行栽培を模倣することで十勝地方においても本州並みの収量が期待できることが示された。これに対し、オオムギ区とベッチ区では塊茎収量がいずれも対照区より低かった。一方、ビニルマルチ区では、塊茎収量が1175.1±317.0g/㎡と対照区に比べ明らかに高い値となった。ビニルマルチによる雑草防除効果と地温維持効果によって収量が改善されたと考えられる。本試験から、十勝地方においてもチョロギの栽培が可能であり、多収化にはビニルマルチの利用が効果的であることが明らかとなった。
Palavras-chave: チョロギ; カバークロップ; マルチ; 塊茎収量; Chinese artichoke; Cover crop; Mulch; Tuber yield.
Ano: 2014 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3996
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Upland rice yield as affected by Brachiaria coverage management AGRIAMBI
Nascente,Adriano S.; Stone,Luís F.; Guimarães,Cleber M..
An important point in no-tillage system is the time between cover crop glyphosate desiccation and rice sowing. This study aimed to verify the effect of Brachiaria ruziziensis management time before rice sowing on rice yield and its components. The experiment was conducted under greenhouse conditions and consisted of four types of B. ruziziensis management: with Brachiaria and with herbicide (WBWH), without Brachiaria shoots and with herbicide (NBWH), without Brachiaria shoots and without herbicide (NBNH), and with Brachiaria and without herbicide (WBNH), at four times: 30, 20, 10, and 0 days, preceding the rice sowing. The amount of B. ruziziensis dry matter increased as the management was done closer to the rice sowing date. The WBWH and WBNH managements...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; No-tillage system; Glyphosate; Cover crop.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100015
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Weeds in a Sugar Cane Soil Cultivated with Crotalaria juncea Planta Daninha
OBRADOR-OLÁN,J.J.; GARCÍA-LÓPEZ,E.; ALMEYDA-SANTOS,L.E.; CASTELÁN-ESTRADA,M.; CARRILLO-ÁVILA,E..
ABSTRACT: Cover crops play an important role in sustainable agriculture, as they decrease soil erosion, promote the incorporation of nitrogen into the soil and reduce or modify weed communities. Aiming at evaluating the changes related to the cultivation and incorporation of sunn crotalaria (Crotalaria juncea L.1753) in a weed community of a soil cultivated with sugarcane, an agro-industrial crop of vital importance to La Chontalpa region, Tabasco, Mexico, an experiment encompassing the cultivation cycle and the incorporation of the dry phytomass of this cover crop was carried out. The treatments included three levels of fertilization and two controls, the plots of the first control were interspersed with those of the treatments, while the second control...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sunn crotalaria; Saccharum; Weed control; Cover crop.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100202
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