scholarly journals DESEMPENHO OPERACIONAL E DADOS AGRONÔMICOS DE TRANSPLANTE MANUAL E MECANIZADO NA CULTURA DA ALFACE

2020 ◽  
Vol 35 (1) ◽  
pp. 29-37
Author(s):  
Samantha Vieira Almeida ◽  
Luiz Felipe Guedes Baldini ◽  
Marco Antonio Tecchio ◽  
Paulo Roberto Arbex Silva
Keyword(s):  
Lactuca Sativa ◽  
Operating Costs ◽  
Operational Performance ◽  
No Tillage ◽  
No Till ◽  
Tillage System ◽  
Number Of Leaves ◽  
Caixa Postal ◽  
Operational Development ◽  
Operational Capacity

DESEMPENHO OPERACIONAL E DADOS AGRONÔMICOS DE TRANSPLANTE MANUAL E MECANIZADO NA CULTURA DA ALFACE1   SAMANTHA VIEIRA DE ALMEIDA2, LUIZ FELIPE GUEDES BALDINI3, MARCO ANTONIO TECCHIO4, PAULO ROBERTO ARBEX SILVA5   1O presente artigo é baseado na dissertação de mestrado do autor. 2Faculdade de Tecnologia de Itapetininga/FATEC, Rua Dr. João Vieira de Camargo, 104, Vila Barth, 18.205-600, Itapetininga/SP, Brasil, [email protected] 3Engenheiro Agrônomo, Mestre, Departamento de Produção Vegetal/Horticultura, Faculdade de Ciências Agronômicas/UNESP,  Caixa Postal 02, 18.640-000, Pardinho/SP, Brasil, [email protected] 4Departamento de Produção Vegetal/Horticultura, Faculdade de Ciências Agronômicas/UNESP, Av. Universitária, 3780, Altos do Paraíso, 18610-034, Botucatu/SP, Brasil, [email protected] 5Departamento de Engenharia Rural e Socioeconômica, Faculdade de Ciências Agronômicas/UNESP, Av. Universitária, 3780, Altos do Paraíso, 18610-034, Botucatu/SP, Brasil, [email protected]   RESUMO: Este trabalho foi realizado para comparar o desempenho operacional no transplante de mudas manual (convencional) ou mecanizado, da cultura da alface, em dois sistemas de plantio, e em duas velocidades de deslocamento. Para realizar o transplante das mudas, foi utilizado o conjunto mecanizado composto por um trator da marca* New Holland, modelo TL60E®, 4x2, com potência nominal de 65 cv e uma transplantadora italiana Fedele Mario, modelo MAX®. O delineamento experimental utilizado foi o fatorial 2x2+1, sendo que os fatores analisados foram dois sistemas de plantio (preparo convencional e plantio direto) e duas velocidades de deslocamento (1ª e 2ª marcha), mais a testemunha, onde os canteiros em preparo convencional foram transplantados manualmente. Foram analisadas as seguintes características da cultura da alface: massa fresca, altura da planta, número de folhas e altura do caule, além do desempenho operacional da máquina e custos operacionais. As médias dos tratamentos foram submetidas a uma análise de variância seguida do Teste Tukey a 5% de probabilidade. A produtividade da cultura da alface não sofreu interferência em relação ao comparativo entre todos os tratamentos estudados. O tratamento com o transplante em sistema de plantio direto na maior velocidade apresentou a maior capacidade operacional do conjunto, sendo viável economicamente.   Palavra-chave: transplantadora, plantio direto, Lactuca sativa, mudas.   OPERATING PERFORMANCE OF MANUAL AND MECHANIZED TRANSPLANTATION AT LETTUCE CROP   ABSTRACT: This work aim was to do comparison between the manual and mechanized transplant of lettuce crop, conventional and no-till, evaluating the operational development of the machine and crop agronomic data in different dislocation speeds. To mechanized transplanting, it was use the mechanized group composed by TL60E® New Holland 4x2 tractor, 65 nominal power and an Italian Fedele Mario MAX® conveyor. The experimental design was the 2x2+1 factorial, where the variables were two plantation system (conventional and direct) and two dislocation speeds (1st and 2nd gear), plus the testimony where the seedbeds were manually transplanted by conventional prepare. The variables were analyzed: fresh weight, plant height, number of leaves and stalk height in addition to the operational performance of the machine and operating costs. All treatments were submitted to an analysis of variance followed by Tukey Test of 5% probability. The treatment with transplant in no-tillage system showed the greatest operational capacity of the set, being economically viable.   Keywords: conveyor, no tillage, Lactuca sativa L, seedlings.

scholarly journals Evolution of some components of agroecosystems productivity from Vinga Plain in water stress situations

2010 ◽  
pp. 174-179
Author(s):  
Daniel Dicu ◽  
Iacob Borza ◽  
Dorin Tarau
Keyword(s):  
Conventional Tillage ◽  
System Level ◽  
Water Volume ◽  
Agricultural System ◽  
No Tillage ◽  
No Till ◽  
Tillage System ◽  
On Line ◽  
New Interactions ◽  
The Impact

The researches are inscribed on line of substantiation of durable agricultural system, having main objective the prominence ofquantitative and qualitative modifications made on agro-system level under the effect of no-tillage system for wheat, maize and soybeans.The experimental field is placed on a cambium chernozem, with a medium content of clay, dominant in the Prodagro West Arad agrocentreand representative for a large surface in the Banat-Crisana Plain.The passing to no-till system change the structure of technological elements, through less soil works, so the impact on agro-system isdifferent comparing with conventional tillage, first less the intervention pressure on agro-system ant secondly appears new interactions, newequilibriums and disequilibriums.Considering the evolution of soil humidity, the observations made monthly (by taking soil samples and laboratory determinations) forthe three cultures showed that in the no-till system, there are more uniform values in the soil profile, and in the variants where the deep workof soil was made it could be observed a low increase of the water volume in the soil.

scholarly journals PRODUÇÃO E MANUTENÇÃO DE PALHADA DE SORGO POR APLICAÇÃO HORMÉTICA DE HERBICIDAS

2021 ◽  
Vol 36 (1) ◽  
pp. 165-174
Author(s):  
Tiago Pereira da Silva Correia ◽  
Arthur Gabriel Caldas Lopes ◽  
Francisco Faggion ◽  
Leandro Augusto Felix Tavares ◽  
Paulo Roberto Arbex Silva
Keyword(s):  
Dry Matter ◽  
Lignin Content ◽  
No Tillage ◽  
No Till ◽  
Sorghum Grains ◽  
Tillage System ◽  
The University ◽  
And Control ◽  
Herbicide Glyphosate ◽  
Sorghum Straw

PRODUÇÃO E MANUTENÇÃO DE PALHADA DE SORGO POR APLICAÇÃO HORMÉTICA DE HERBICIDAS   TIAGO PEREIRA DA SILVA CORREIA1, ARTHUR GABRIEL CALDAS LOPES2, FRANCISCO FAGGION3, LEANDRO AUGUSTO FELIX TAVARES4, PAULO ROBERTO ARBEX SILVA5   1Docente da Faculdade de Agronomia e Medicina veterinária, Universidade de Brasília, Campos universitário Darcy Ribeiro ICC, cep:70910-900, Asa norte, Brasília, DF, Brasil. [email protected] 2Doutorando do PPGA da Universidade de Brasília, Campos universitário Darcy Ribeiro ICC, cep:70910-900, Asa norte, Brasília, DF, Brasil. [email protected] 3Docente da Faculdade de Agronomia e Medicina veterinária, Universidade de Brasília, Campos universitário Darcy Ribeiro ICC, cep:70910-900, Asa norte, Brasília, DF, Brasil. [email protected] 4Docente do Instituto de Ciências Agrárias da Universidade Federal dos Vales do Jequitinhonha e Mucuri, Av. Universitária, 1000, Bairro universitário, cep:38610-000, Unaí, MG, Brasil. [email protected] 5Docente da Faculdade de Ciências Agronômicas da Universidade Estadual Paulista “Júlio de Mesquita Filho”, Campos de Botucatu, Av. Universitária, 3780, cep:18610-034, Altos do paraíso, Botucatu, SP, Brasil. [email protected]   RESUMO: No sistema plantio direto a manutenção de palhada sobre o solo é essencial, especialmente em regiões onde a decomposição é rápida. O objetivo do trabalho foi avaliar a aplicação de subdoses de herbicida Glifosato, 2,4 D e Haloxifope-P-Ester Metílico na produção e manutenção de palhada de sorgo ao sistema plantio direto. O experimento foi realizado na Fazenda Experimental Água Limpa, pertencente a Universidade de Brasília. Foi utilizado um esquema fatorial 3 (Herbicidas: Glifosato; 2,4-D Sal Dimetilamina; Haloxifope-P-Ester metílico) x 2 (Subdoses: 4 e 6 g i.a ha-1 de Glifosato; 0,6 e 1,2 g i.a ha-1 de Haloxifope-P-metílico; 80 e 160 g i.a ha-1 de 2,4-D Sal Dimetilamina), com quatro repetições inteiramente casualizadas. Aos tratamentos incluiu-se um testemunha sem aplicação de subdoses. As subdoses menor, maior e testemunhas foram identificadas por D1, D2 e D0 respectivamente. Os tratamentos foram aplicados 35 dias após a semeadura com pulverizador tratorizado, e a partir dos 100 dias foram avaliados teor de lignina (TL), massa de materia seca (MMS) e produtiviade de grãos. D2 de Glifosato aumenta 5,35% a MMS e 3% o TL da palhada de sorgo e não difere a produtividade de grãos da cultura. D1 de Haloxifope-P-Ester Metílico aumenta 9,2% a MMS da planta de sorgo. As subdoses dos demais herbicidas estudados reduzem a produtividade de grãos de sorgo.   Palavras-chave: plantio direto, cobertura vegetal, subdose, glifosato, 2,4D.   PRODUCTION AND MAINTENANCE OF SORGHUM STRAW BY HORMETIC APPLICATION OF HERBICIDES   ABSTRACT: In the no-tillage system, maintaining straw over the soil is essential, especially in regions where decomposition is rapid. The work aimed to evaluate the application of underdoses of herbicide Glyphosate, 2,4 D and Haloxifope-P-Ester Methyl in the production and maintenance of sorghum straw to the no-tillage system.  The experiment was conducted at the Experimental Água Limpa Farm, belonging to the University of Brasília. A factorial scheme 3 (Herbicides: Glyphosate; 2,4-D Dimethylamine salt; Haloxifop-P-methyl ester) x 2 (Subdoses: 4 and 6 g ia ha-1 of Glyphosate; 0.6 and 1.2 g Haloxifop-P-methyl ia ha-1; 80 and 160 g ia 2,4-D salt Dimethylamine), with four completely randomized repetitions. The treatments included a control without the application of underdoses. The minor, major and control subdoses were identified by D1, D2 and D0 respectively. The treatments were applied 35 days after sowing with tractor spray, and after 100 days, lignin content (TL), dry matter mass (MMS) and grain yield were evaluated. The D2 treatment of Glyphosate presents MMS 5.35% higher at 190 days after sowing. The same treatment increased the TL by 3% and did not differ in the productivity of sorghum grains.   Keywords: no-till, vegetation cover, underdosing, glyphosate, 2,4D.

scholarly journals PHOSPHORUS FRACTIONS AND AVAILABILITY IN A HAPLIC PLINTHOSOL UNDER NO-TILLAGE SYSTEM IN THE BRAZILIAN CERRADO

2015 ◽  
Vol 39 (3) ◽  
pp. 216-224 ◽  
Author(s):  
Leonardo Ricardo Rotta ◽  
Helder Barbosa Paulino ◽  
Ibanor Anghinoni ◽  
Edicarlos Damacena de Souza ◽  
Guilherme Lopes ◽  
...  
Keyword(s):  
Crop Yields ◽  
Cropping Systems ◽  
P Availability ◽  
No Tillage ◽  
No Till ◽  
P Accumulation ◽  
P Content ◽  
Tillage System ◽  
Anthropic Influence ◽  
Labile P

Soil use and fertilizer management as well as cropping systems influence phosphorus (P) availability in the soil. This study evaluated P fractions and availability in a chronosequence of anthropic influence in a Haplic Plinthosol, in sites under no-till for different time periods: seven (NT7), eleven (NT11), and sixteen (NT16) years. Labile P concentrations in the soil accounted for 10%, 8%, and 9% of the total P for treatments NT7, NT11, and NT16, respectively. The labile P values ranged between 99 and 122 mg dm-3andindicatied no time in no-tillage influence on labile P under in the studied Plinthosol. However, moderately labile P contents increased with time: NT7 < NT11 < NT16 (237, 341, and 375 mg dm-3, respectively). This increased followed the elevation in iron oxide contents, indicating a relationship between mineralogy and P accumulation. Regardless of no-tillage period, P contents extracted by Mehlich-1 were lower, underestimating the available P content, when compared with the extraction using a P selective resin. The stocks of labile P were sufficient to maintain high crop yields, according to the recommendations for the Cerrado region. Even if labile P contents are reduced, when adopting no-till system, the contents and stocks of P in the soil after several years were high enough to provide for adequate crop yields.

scholarly journals No-Tillage and Phosphate Fertilization Management on Soybean Culture in Brazilian Cerrado

2018 ◽  
Vol 10 (5) ◽  
pp. 125
Author(s):  
Robson Da Costa Leite ◽  
Rubson Da Costa Leite ◽  
Jefferson Santana da Silva Carneiro ◽  
Gilson Araújo de Freitas ◽  
Antônio Carlos Martis dos Santos ◽  
...  
Keyword(s):  
Block Design ◽  
Phosphorus Efficiency ◽  
Maximum Efficiency ◽  
No Tillage ◽  
Brazilian Cerrado ◽  
No Till ◽  
Phosphate Fertilization ◽  
Tillage System ◽  
Soybean Plants ◽  
Four Levels

Despite the benefits of no-till practices, soil compaction is a problem that can cause, among other things, mechanical impediment to root growth and less response to soil fertilization. The objective of this study was to evaluate the effect of subsoiling and doses of phosphate fertilization on soybean that have been cultivated over ten years under no-till systems in the Brazilian Cerrado. The experiment consisted of a randomized complete block design in a 2 × 4 factorial arrangement. Two managements in consolidated no-tillage area were considered: with and without subsoiling, along with four levels of phosphate fertilization: 0, 100, 300 and 400 kg ha-1 of P2O5. The practice of subsoiling in an area with ten years of no-till system provided an increase of 124.38 kg ha-1 in soybean productivity. Soybean plants grown under no-tillage system, with subsoil management, showed better development and pod production. The maximum phosphorus efficiency, with subsoiling, was achieved with the dose of 172 kg ha-1 of P2O5, yielding 5,693.4 kg ha-1. In the no-tillage system, the maximum efficiency dose and crop yield were 159 kg ha-1 of P2O5 and 5434.2 kg ha-1, respectively.

In-Crop and Autumn-Applied Glyphosate Reduced Purple Nutsedge (Cyperus rotundus) Density in No-Till Glyphosate-Resistant Corn and Soybean

2009 ◽  
Vol 23 (3) ◽  
pp. 384-390 ◽  
Author(s):  
Krishna N. Reddy ◽  
Charles T. Bryson
Keyword(s):  
Management Strategy ◽  
Block Design ◽  
Shoot Density ◽  
Cyperus Rotundus ◽  
No Tillage ◽  
Herbicide Application ◽  
Purple Nutsedge ◽  
No Till ◽  
Randomized Complete Block Design ◽  
Tillage System

A 3-yr field study was conducted from 2005 to 2007 at Stoneville, MS, to determine efficacy of in-crop and autumn-applied glyphosate on purple nutsedge density and yield of no-till glyphosate-resistant (GR) corn and GR soybean. Separate experiments were conducted in GR corn and GR soybean in areas maintained under a no-tillage system after the autumn of 2004. Each experiment was conducted in a split-plot arrangement of treatments in a randomized complete-block design with and without autumn application of glyphosate at 1.68 kg ae/ha as main plots and in-crop herbicide application (glyphosate- and nonglyphosate-based programs) as subplots with three replications. In GR corn, glyphosate applied in the autumn reduced purple nutsedge density by 40 to 67% compared with no glyphosate during 3 yr. In GR corn, glyphosate applied in-crop reduced purple nutsedge shoot density by 48% in 2005, 92% in 2006, and 100% in 2007 compared with no herbicide. However, GR corn yields were unaffected by either in-crop or autumn-applied glyphosate. In GR soybean, glyphosate applied in the autumn reduced purple nutsedge shoot density by 64 to 83% compared with no glyphosate during 3 yr. Glyphosate applied in-crop in GR soybean reduced purple nutsedge density by 81% in 2005 and by 100% in 2006 and 2007 compared with no herbicide. GR soybean yields were similar in 2005, but yields were 34 and 18% higher in 2006 and 2007, respectively, with autumn-applied glyphosate compared with no glyphosate. GR soybean yields were higher with glyphosate applied in-crop compared with no herbicide in 2 of 3 yr. These results indicate that purple nutsedge density could be reduced with glyphosate applied in-crop in no-till GR corn and GR soybean. In addition, autumn-applied glyphosate was effective in reducing purple nutsedge populations following harvest of crops and could be an effective purple nutsedge management strategy regardless of GR trait.

scholarly journals OFF-SEASON STRATEGIES TO IMPROVE SOIL PHYSICAL ATTRIBUTES IN A NO-TILL SYSTEM IN THE BRAZILIAN CERRADO

2020 ◽  
Vol 19 ◽  
pp. 13
Author(s):  
RANIER VIEIRA FERREIRA ◽  
ROSE LUIZA MORAES TAVARES ◽  
SILVIO VASCONCELOS PAIVA FILLHO ◽  
INDIAMARA MARASCA ◽  
ALESSANDRO GUERRA SILVA
Keyword(s):  
Dry Matter ◽  
Block Design ◽  
Soil Bulk Density ◽  
No Tillage ◽  
Brazilian Cerrado ◽  
No Till ◽  
Randomized Complete Block Design ◽  
Tillage System ◽  
Physical Attributes ◽  
Resistance To Penetration

In the central region of Brazil, sorghum and maize are considered viable crop alternatives to be cultivated during off-season periods, mainly for the production of grains in succession to the cultivation of soybeans and intercropping with brachiaria grasses. This study aimed to evaluate the physical soil qualities of the soil from an area with different off-season management histories (monoculture or agricultural intercropping). Maize, sorghum and brachiaria crops have been cultivated under no-tillage system. The experiment was conducted using a randomized complete block design, with four replications. The treatments included: monoculture or intercropping between sorghum and brachiaria (first off-season strategy) or maize and brachiaria (second off-season strategy). The following physical properties of the soil were evaluated: soil bulk density, porosity, soil resistance to penetration, soil moisture and texture and the contents of organic carbon, which were analyzed at 0-20, 20-40 and 40-60 cm deep. In the off-season, the cultivation of single brachiaria promoted a greater amount of dry matter when compared with sorghum- brachiaria or maize-brachiaria intercropping. The topsoil presented better physical quality when compared with the adjacent layers under no-tillage system. The use of brachiaria combined with sorghum or maize tends to improve the macro and microporosity of the soil.

Liming demand and plant growth improvements for an Oxisol under long-term no-till cropping

2017 ◽  
Vol 155 (7) ◽  
pp. 1093-1112 ◽  
Author(s):  
A. C. A. CARMEIS FILHO ◽  
C. A. C. CRUSCIOL ◽  
A. M. CASTILHOS
Keyword(s):  
Root Length Density ◽  
Cropping Systems ◽  
Cropping System ◽  
No Tillage ◽  
Tropical Regions ◽  
No Till ◽  
Rotation Scheme ◽  
Tropical Conditions ◽  
Tillage System

SUMMARYThe adequate management of soil acidity has long been a challenge in no-till (NT) cropping systems. Some studies conducted in sub-tropical conditions have demonstrated the feasibility of surface liming. However, for tropical regions with dry winters, little long-term information about adequate rates and frequencies of application is available. A 12-year field trial was performed under a tropical no-tillage system with an annual crop rotation scheme. The treatments were composed of four lime rates (0, 1000, 2000 and 4000 kg/ha), estimated via the base saturation (BS) method. Surface application of lime was found to be an effective method for improving the soil fertility profile under this long-term NT cropping system. All three acidity components (pH, hydrogen + aluminium (H + Al), exchangeable Al) and some fertility attributes (phosphorus, exchangeable calcium and magnesium, and BS) were adjusted to a linear function, and better soil chemical conditions were obtained in the 4000 kg/ha treatment, even 4 years after the final application. Due to soil chemical changes, the root length density of wheat and common bean was greater at depths <0·20 m, which led to a higher grain yield, even under unfavourable weather conditions. The results indicate that the application of lime at higher rates can be an acceptable criterion for a tropical Oxisol under a no-tillage system, reducing the frequency of lime application.

scholarly journals Predacious activity of Ants (Hymenoptera: Formicidae) in conventional and in No-till agriculture systems

2008 ◽  
Vol 51 (6) ◽  
pp. 1199-1207 ◽  
Author(s):  
Denise Lange ◽  
Wedson Desidério Fernandes ◽  
Josué Raizer ◽  
Odival Faccenda
Keyword(s):  
Pest Management ◽  
Sampling Time ◽  
No Tillage ◽  
Foraging Activity ◽  
Conventional System ◽  
Ant Communities ◽  
No Till ◽  
Tillage System ◽  
Agriculture Systems

This study had the objective of assessing the differences in foraging activity of the predacious ants between two areas, one conventional and other with no-till agriculture systems. The research was conducted in two contiguous 1.5 ha plots in Dourados MS, Brazil, from February 2001 to December 2003. Each plot received 750 baits (Nasutitermes termites), 425 at daylight and 325 at night. The termites were placed on the filter paper, on the ground, and ant attack was monitored for 15 min, until removed. Sixteen ant species were found in the no-till system and nine in the conventional system. Baits removed from no-till were significantly higher than the conventional plots and were influenced by the sampling time, at day or night. The seasons of the year did not significantly explain the variations in the structure of the predacious ant communities in neither of the systems. The significant differences at foraging activity and ant richness between the areas indicated that the no-tillage system could improve environmental quality of the cropping and therefore, became an important tool for the integrated pest management programs.

scholarly journals COMPARATIVE BIODIVERSITY BETWEEN NO-TILL AND CONVENTIONAL TILL ON A CROP ROTATION

AGROFOR ◽  
2019 ◽  
Vol 3 (3) ◽  
Author(s):  
Manuel MORENO-GARCÍA ◽  
Miguel Ángel REPULLO-RUIBÉRRIZ DE TORRES ◽  
Rosa María CARBONELL-BOJOLLO ◽  
Rafaela ORDÓÑEZ-FERNÁNDEZ
Keyword(s):  
Crop Rotation ◽  
Biological Diversity ◽  
Technological Development ◽  
Soil Surface ◽  
Conventional Tillage ◽  
No Tillage ◽  
Natural Processes ◽  
No Till ◽  
Agronomic Management ◽  
Tillage System

The technological development that agriculture has suffered in recent decades hasaffected biological diversity in agricultural fields. In particular, the life on the soilsurface, that is mainly constituted by invertebrates. This loss of biodiversity entailsthe disappearance of natural processes that this organisms support. For this reason,it is necessary to implement agronomic management that reduces impacts onagricultural soils. One of these alternatives is no-tillage system, which ischaracterized by the absence of soil ploughing and the maintenance of cropresidues on soil surface. In this sense, the present work has compared the existingbiodiversity in a crop rotation (sunflower-wheat-legume) between plots under notillageand plots under conventional tillage systems. With this objective, insects,arachnids, crustaceans and myriapods have been captured through pitfall traps.Four plots have been sampled, 2 under no-tillage and 2 under conventional tillage.In each plot have been placed 4 sampling areas, consisting of 5 pitfall traps each.The catches made have shown higher biodiversity values in no-tillage compared toconventional tillage. These differences have been significantly higher in terms ofnumber of species captured and with respect to the biodiversity indices ofMargalef, Simpson and Shannon. However, the increases in number of individualscaptured has not been significant as well as the uniformity indices of Pielou andSimpson.

Effects of Cover Crops and Tillage on Sweet Corn Production

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 476d-476
Author(s):  
Gary R. Cline ◽  
Anthony F. Silvernail
Keyword(s):  
Cover Crops ◽  
Sweet Corn ◽  
N Fertilization ◽  
Winter Rye ◽  
No Tillage ◽  
Corn Production ◽  
Total N ◽  
No Till ◽  
Winter Cover ◽  
Winter Cover Crops

A split-plot factorial experiment examined effects of tillage and winter cover crops on sweet corn in 1997. Main plots received tillage or no tillage. Cover crops consisted of hairy vetch, winter rye, or a mix, and N treatments consisted of plus or minus N fertilization. Following watermelon not receiving inorganic N, vetch, and mix cover cropsproduced total N yields of ≈90 kg/ha that were more than four times greater than those obtained with rye. However, vetch dry weight yields (2.7 mg/ha) were only about 60% of those obtained in previous years due to winter kill. Following rye winter cover crops, addition of ammonium nitrate to corn greatly increased (P < 0.05) corn yields and foliar N concentrations compared to treatments not receiving N. Following vetch, corn yields obtained in tilled treatments without N fertilization equaled those obtained with N fertilization. However, yields obtained from unfertilized no-till treatments were significantly (P < 0.05) lower than yields of N-fertilized treatments. Available soil N was significantly (P < 0.05) greater following vetch compared to rye after corn planting. No significant effects of tillage on sweet corn plant densities or yields were detected. It was concluded that no-tillage sweet corn was successful, and N fixed by vetch was able to sustain sweet corn production in tilled treatments but not in no-till treatments.In previous years normal, higher-yielding vetch cover crops were able to sustain sweet corn in both tilled and no-till treatments.

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