scholarly journals Rentabilidad económica de explotaciones agrarias de secano según tamaño y tipo de laboreo

2011 ◽  
Vol 8 (2) ◽  
pp. 73 ◽  
Author(s):  
A. Serrano ◽  
M. Suárez de Cepeda ◽  
V. Sánchez-Girón
Keyword(s):  
Crop Yields ◽  
Economic Feasibility ◽  
Farm Size ◽  
No Tillage ◽  
Forage Legume ◽  
Central Spain ◽  
Tillage System ◽  
Selection For ◽  
Legume Production ◽  
Semiarid Conditions

The objective of the present study was to assess, in semiarid conditions of central Spain, the economic feasibility of chisel ploughing and no-tillage compared to mouldboard ploughing for rainfed winter wheat and forage legume production on different farm sizes. A decision support system was used to solve for the least-cost machinery selection for each farm enterprise and tillage system considered. No differences were observed in either wheat or forage vetch crop yields averaged across several years, irrespective of the tillage system used. The economic performance was found to depend on the tillage system adopted and farm size.

scholarly journals Geostatistical analysis of crop yield maps in a long term no tillage system

Bragantia ◽  
2010 ◽  
Vol 69 (suppl) ◽  
pp. 9-18 ◽  
Author(s):  
Osvaldo Guedes Filho ◽  
Sidney Rosa Vieira ◽  
Marcio Koiti Chiba ◽  
Célia Regina Grego
Keyword(s):  
Crop Yield ◽  
Crop Yields ◽  
Spherical Model ◽  
Exponential Model ◽  
Spatial And Temporal Variability ◽  
No Tillage ◽  
Yield Data ◽  
The North ◽  
Tillage System

It is known, for a long time, that crop yields are not uniform at the field. In some places, it is possible to distinguish sites with both low and high yields even within the same area. This work aimed to evaluate the spatial and temporal variability of some crop yields and to identify potential zones for site specific management in an area under no-tillage system for 23 years. Data were analyzed from a 3.42 ha long term experimental area at the Centro Experimental Central of the Instituto Agronômico, located in Campinas, Sao Paulo State, Brazil. The crop yield data evaluated included the following crops: soybean, maize, lablab and triticale, and all of them were cultivated since 1985 and sampled at a regular grid of 302 points. Data were normalized and analyzed using descriptive statistics and geostatistical tools in order to demonstrate and describe the structure of the spatial variability. All crop yields showed high variability. All of them also showed spatial dependence and were fitted to the spherical model, except for the yield of the maize in 1999 productivity which was fitted to the exponential model. The north part of the area presented repeated high values of productivity in some years. There was a positive cross correlation amongst the productivity values, especially for the maize crops.

scholarly journals Surface applied lime dynamics and base saturation index in a consolidated no-tillage area

2017 ◽  
Vol 7 (4) ◽  
pp. 473
Author(s):  
Diego Bortolini ◽  
Luís César Cassol ◽  
Jonatas Thiago Piva ◽  
Cristiam Bosi ◽  
Kassiano Felipe Rocha
Keyword(s):  
Grain Yield ◽  
Dry Matter ◽  
Crop Yields ◽  
Saturation Index ◽  
Block Design ◽  
Chemical Properties ◽  
Base Saturation ◽  
No Tillage ◽  
Dry Matter Yield ◽  
Tillage System

The aim of this study was to evaluate the behavior of chemical properties and crop yields during five years after liming, in a consolidated no-tillage system area and indicate a base saturation index to serve as a criterion for recommendation. The experiment was conducted in a randomized complete block design with four repetitions, being the treatments the five lime doses (0, 2.4, 4.8, 7.2 and 9.6 Mg ha-1) applied and maintained on the soil surface. Soil chemical properties were evaluated in eight soil sampling, in the layers 0 to 0.025; 0.025 to 0.05; 0.05 to 0.10; 0.10 to 0.15; 0.15 to 0.20 and 0.20 to 0.40 m, besides crop grain yield (wheat, soybean and corn) and black oat dry matter yield, totaling five years of evaluation. The surface liming in no-tillage system increased the exchangeable magnesium and calcium contents, base saturation and soil pH and reduced the exchangeable aluminum content. The cumulative grain yield (six crops) and black oat dry matter yield (three crops) was not influenced by liming. These results suggested, from this study conditions, that the value of 50% of base saturation should be adopted as a criterion for liming for crops implanted under consolidated no-tillage systems.

scholarly journals Spatial and temporal distribution of weeds in no-tillage system

2016 ◽  
Vol 20 (12) ◽  
pp. 1107-1111
Author(s):  
Eduardo L. Bottega ◽  
Camilo Pegoraro ◽  
Naiara Guerra ◽  
Antonio M. de Oliveira Neto ◽  
Daniel M. de Queiroz
Keyword(s):  
Spatial Dependence ◽  
Crop Yields ◽  
Arable Land ◽  
Temporal Distribution ◽  
Geostatistical Analysis ◽  
Sampling Point ◽  
No Tillage ◽  
Sonchus Oleraceus ◽  
Tillage System ◽  
Information Bank

ABSTRACT Brazil is one of the largest grain producers in the world, due to its extensive arable land and favorable climate for the cultivation of any species. The production could be higher, but problems such as competition between crops and weeds reduces crop yields. This study aimed to analyze the spatial distribution of weeds, especially milkweed (Sonchus oleraceus), horse weed (Conyza spp.) and ‘maria-mole’ (Senecio brasiliensis) in an area under no-tillage system for two harvests. The work was carried out during the 2013/14 and 2014/15 crop years in an area of 22.5 ha, where soybean is grown in the summer and oat in the winter. The weeds were mapped using a sampling grid of 85 points. The number of plants present in 0.25 m2 was recorded at each sampling point. The data collected in the field composed the information bank and were used for geostatistical analysis and production of maps. Using geostatistical analysis, it was possible to map the horseweed infestation in the studied area for the 2013/14 season. The species ‘maria-mole’ and milkweed did not show spatial dependence. During the 2014/2015 season, because of the management carried out in the off season, none of the studied species showed spatial dependence.

scholarly journals Occasional soil tillage, liming, and nitrogen fertilization on long-term no-tillage system

2018 ◽  
Vol 53 (7) ◽  
pp. 833-839
Author(s):  
Renato Yagi
Keyword(s):  
Nitrogen Fertilization ◽  
Crop Yields ◽  
Block Design ◽  
Wheat Yield ◽  
Soil Surface ◽  
N Fertilization ◽  
Residual Effects ◽  
Soil Tillage ◽  
No Tillage ◽  
Tillage System

Abstract: The objective of this work was to evaluate the residual effects of occasional soil tillage in a 17-year-old, no-tillage system, associated with liming and nitrogen fertilization, on the crop yields and chemical properties of a very clayey Oxisol in the South of Brazil. A randomized complete block design in split-split plots was used, with two soil managements (with or without plowing), two liming treatments (with or without the required dose to raise base saturation to 70%), five N doses applied on side-dress (0, 1, 2, 4, and 6 times the recommended amounts), and four replicates. A rotation system was used with corn and soybean in the summer, and with wheat and black oats in the winter. The residual effects of occasional soil tillage in a consolidated no-tillage system do not supplant those of liming applied on soil surface, in periods of water deficit, which subsidizes the recommendation to maintain the system consolidated. Excess N fertilization in no-tillage, with liming applied only on soil surface, may harm wheat yield, acidifying the topsoil and leaching Mg2+ to the subsurface soil layers. Without liming, soil acidification is more intense with N fertilization, which, however, favors the accumulation of organic matter on soil surface in a consolidated no-tillage system.

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.

No-Tillage Agriculture

Science ◽  
1980 ◽  
Vol 208 (4448) ◽  
pp. 1108-1113 ◽  
Author(s):  
Ronald E. Phillips ◽  
Grant W. Thomas ◽  
Robert L. Blevins ◽  
Wilbur W. Frye ◽  
Shirley H. Phillips
Keyword(s):  
Agricultural Land ◽  
Crop Yields ◽  
Agricultural Practices ◽  
Cropping System ◽  
The United States ◽  
Conventional Tillage ◽  
No Tillage ◽  
Tillage Practices ◽  
Tillage System ◽  
Year 2000

The no-tillage cropping system, a combination of ancient and modern agricultural practices, has been rapidly increasing in use. By the year 2000, as much as 65 percent of the acreage of crops grown in the United States may be grown by the no-tillage practice. Soil erosion, the major source of pollutants in rural streams, is virtually eliminated when no-tillage agriculture is practiced. The no-tillage system reduces the energy input into corn and soybean production by 7 and 18 percent, respectively, when compared to the conventional tillage system of moldboard plowing followed by disking. In addition, crop yields are as high as or higher than those obtained with traditional tillage practices on large areas of agricultural land.

scholarly journals Diversity and Longevity of the Soybean Debris Mycobiota in a No-Tillage System

Plant Disease ◽  
1997 ◽  
Vol 81 (5) ◽  
pp. 530-534 ◽  
Author(s):  
R. E. Baird ◽  
B. G. Mullinix ◽  
A. B. Peery ◽  
M. L. Lang
Keyword(s):  
Cover Crops ◽  
Survival Rates ◽  
Fungal Species ◽  
No Tillage ◽  
Cercospora Kikuchii ◽  
Tillage System ◽  
Mesh Bags ◽  
Colletotrichum Spp ◽  
The Mean ◽  
Total Fungi

The survival of the mycobiota on pod and stem debris of soybean produced in a no-tillage system with cover crops of alfalfa, canola, rye, or wheat or with no cover was studied during 1994 and 1995. Fiberglass mesh bags containing pods and stems were assayed every 28 to 31 days to determine the isolation frequency of fungi. Over 90% of the 11,906 isolates obtained were members of the Deuteromycotina. The most common genera isolated were Alternaria, Cercos-pora, Colletotrichum, Epicoccum, Fusarium, and Phoma. Alternaria spp. had the greatest isolation frequencies and constituted 40% of the total cultures. Numbers of total fungi (all fungi isolated) on sampling dates in 1994 were similar to the totals in 1995. In May 1994, the mean isolation rates for many of the fungal species were significantly lower (P = 0.05) in several of the cover crops, but no consistent pattern could be determined. Common soybean pathogens isolated included Colletotrichum spp., Diaporthe spp., and Cercospora kikuchii. Fusarium graminearum, which is responsible for several diseases of maize and wheat, was commonly isolated during this study. Of the Diaporthe spp. (anamorph Phomopsis spp.), 87% were identified as D. phaseolorum var. sojae. Colletotrichum spp. were identified as C. truncatum in 85% of the isolates, C. destructivum (teleomorph Glomerella glycines) in 12%, and both species in 3%. Cercospora kikuchii was more commonly isolated from pods than from stem tissue, and Colletotrichum spp. occurred more frequently on stems. Isolation frequencies of Diaporthe spp. were greater in May of both years than in the preceding months. These results show that no-tillage soybean debris harbors numerous fungi pathogenic to soybean, and producers who grow soybeans continuously may find more disease in this crop and lower yields. Fungi that attack crops such as maize and wheat were commonly isolated from soybean debris in both years, and a no-tillage rotation which includes maize or wheat could result in increased disease in these crops. Isolation frequencies of the fungi from cover crops varied with the sampling date, but no consistent patterns could be determined for a particular cover crop or fungal species. This is the first detailed study of survival rates of soybean, maize, and wheat pathogens that overwinter on soybean debris in a no-tillage system.

scholarly journals Chemical attributes of a Hapludox soil after nine years of pig slurry application

2012 ◽  
Vol 47 (12) ◽  
pp. 1766-1773 ◽  
Author(s):  
Milton da Veiga ◽  
Carla Maria Pandolfo ◽  
Alvadi Antonio Balbinot Junior ◽  
Evandro Spagnollo
Keyword(s):  
Chemical Reaction ◽  
Soil Samples ◽  
Pig Slurry ◽  
No Tillage ◽  
Nutrient Contents ◽  
Continuous Application ◽  
Tillage System ◽  
Chemical Attributes ◽  
High Doses ◽  
Cu And Zn

The objective of this study was to evaluate the pig slurry application effects on chemical attributes of a Hapludox soil managed under no-tillage system. Treatments consisted of 50, 100 and 200 m³ ha-1 per year of pig slurry application, and a control with replacement of P and K exported through harvested grains. Attributes related to soil chemical reaction, exchange complex, and nutrient contents were determined in soil samples collected in the ninth year of experimentation from 0 - 0.025, 0.025 - 0.05, 0.05 - 0.10, 0.10 - 0.20, 0.20 - 0.40 and 0.40 - 0.60 m soil depths. The continuous application of high doses of pig slurry on the Oxisol surface under no-tillage acidifies the soil and increases Al, P, Cu, and Zn contents down to 0.2-m depth, and K levels down to 0.6-m depth.

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