Different Residues Affect Wheat Nutritional Composition

Abstract Conservation agriculture using crop rotation benefits the environment, soil fertility, and crop production. A biannual rotation experiment during a period of 2 years was conducted in volcanic soil in south-central Chile in a production system under conservation agriculture. The experiment considered two previous crops, canola (Brassica napus L.) and bean (Phaseolus vulgaris L.), and four levels of residue incorporation (0%, 50%, 100%, and 200% of generated residue). Grain yield (0.41 Mg ha−1), grain sedimentation value (5.5%), grain K (0.031%) and Ca (0.006%) concentrations, and residue K concentration (0.159%) were higher when the previous crop was bean. The Ca concentration (0.037%) in wheat residue increased after the canola crop. The different applied residue levels of the previous crop had no effect on any of the evaluated parameters in wheat. There was a very consistent negative correlation between the grain S concentration and the residue P (− 0.55), K (− 0.55), Mg (− 0.61), and S (− 0.63) concentrations in wheat when it was cultivated after bean. A larger number of study cycles are required to obtain more consistent results about the effect of the different residue levels on these two biannual rotations.

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The effect of crop-pasture rotations on the C, N and S contents of soil aggregates and structural stability in a volcanic soil of south-central Chile

Acta Agriculturae Scandinavica Section B - Soil & Plant Science ◽

10.1080/09064710600925836 ◽

2007 ◽

Vol 57 (3) ◽

pp. 255-262 ◽

Cited By ~ 4

Author(s):

Marco A. Sandoval ◽

Neal B. Stolpe ◽

Erick M. Zagal ◽

María Mardones

Keyword(s):

Structural Stability ◽

Soil Aggregates ◽

Volcanic Soil ◽

Central Chile ◽

South Central

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Economic and environmental studies of conservation agriculture on dryland in Central Lombok, Indonesia

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/913/1/012015 ◽

2021 ◽

Vol 913 (1) ◽

pp. 012015

Author(s):

E Lastariningsih ◽

T Sjah ◽

I G L P Tanaya

Keyword(s):

Environmental Impacts ◽

Crop Production ◽

Agricultural Development ◽

Crop Residues ◽

Positive Impact ◽

Conservation Agriculture ◽

Chemical Fertilizer ◽

Primary Data ◽

Labor Costs ◽

Previous Crop

Abstract Agricultural development needs to pay attention to environmental issue since the economic only focus of the development threatens. One of the moves into this environmental awareness is by practicing conservation agriculture. This paper aims to analyze the economic and environmental impacts of implementing conservation agriculture practices which is implemented with the application of manure, mulch of previous crop residue and legumes as cover crop comparing to non conservation agriculture which is implemented high chemical fertilizer, herbicide, no mulch and plants only maize on dryland in Central Lombok, Indonesia. Economic and environmental impacts of conservation agriculture are identified by comparing conservation agriculture with non-conservation agriculture practices. Data were collected through observations by researchers, farmers, and extension workers. The primary data are accompanied by data from secondary sources, such as literatures and research reports. Data were analyzed quantitatively and qualitatively, providing figures as well as descriptive explanation. The result of analysis showed that Conservation agriculture, implemented with the application of manure and mulch of previous crop residues, economically was able to reduce the purchase of herbicides and chemical fertilizer, save labor costs and time in plant maintenance. Conservation agriculture practice is environmentally friendly because was able to reduce air pollution, retain groundwater and add soil organic matter. In addition, farmers income increase in conservation agriculture through diversification of crop production and savings in production cost. The positive impact of conservation agriculture, economically and environmentally leads to the recommendation to expand the practice of conservation agriculture, in the location or elsewhere.

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Intertidal zonation patterns of macroinfauna over a range of exposed sandy beaches in south-central Chile

Marine Ecology Progress Series ◽

10.3354/meps101105 ◽

1993 ◽

Vol 101 ◽

pp. 105-118 ◽

Cited By ~ 57

Author(s):

E Jaramillo ◽

A McLachlan ◽

P Coetzee

Keyword(s):

Sandy Beaches ◽

Central Chile ◽

South Central ◽

Intertidal Zonation ◽

Zonation Patterns

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Cardiorespiratory Fitness: Reference on the Six-Minute Walk Test and Oxygen Consumption in Adolescents from South-Central Chile

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18052474 ◽

2021 ◽

Vol 18 (5) ◽

pp. 2474

Author(s):

Jaime Vásquez-Gómez ◽

Nelson Gatica Salas ◽

Pedro Jiménez Villarroel ◽

Luis Rojas-Araya ◽

Cesar Faundez-Casanova ◽

...

Keyword(s):

Cardiorespiratory Fitness ◽

Reference Values ◽

Estimation Error ◽

Walk Test ◽

Central Chile ◽

Six Minute Walk Test ◽

Body Adiposity ◽

South Central ◽

Males And Females ◽

Minute Walk

Cardiorespiratory fitness (CRF) provides oxygen to the exercising muscles and is related to body adiposity, with cardiometabolic variables. The aim was to develop reference values and a predictive model of CRF in Chilean adolescents. A total of 741 adolescents of both genders (15.7 years old) participated in a basic anthropometry, performance in the six-minute walk test (SMWT), and in Course Navette was measured. Percentiles were determined for the SMWT, for the V̇O2max, and an equation was developed to estimate it. The validity of the equation was checked using distribution assumptions and the Bland–Altman diagram. The STATA v.14 program was used (p < 0.05). The 50th percentile values for males and females in the SMWT and in the V̇O2max of Course Navette were, respectively, from 607 to 690 and from 630 to 641 m, and from 43.9 to 45 and from 37.5 to 31.5 mlO2·kg·min−1, for the range of 13 to 17 years. For its part, the model to predict V̇O2max incorporated gender, heart rate, height, waist-to-height ratio (WHR), and distance in the SMWT (R2 = 0.62; estimation error = 0.38 LO2·min−1; p <0.001). Reference values can guide physical fitness in Chilean adolescents, and V̇O2max was possible to predict from morphofunctional variables.

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A Strip-Till One-Pass System as a Component of Conservation Agriculture

Agronomy ◽

10.3390/agronomy10122015 ◽

2020 ◽

Vol 10 (12) ◽

pp. 2015

Author(s):

Iwona Jaskulska ◽

Kestutis Romaneckas ◽

Dariusz Jaskulski ◽

Piotr Wojewódzki

Keyword(s):

Co2 Emissions ◽

Soil Loss ◽

Soil Surface ◽

Conservation Agriculture ◽

Plant Residues ◽

Pass System ◽

Previous Crop ◽

Bacteria And Fungi ◽

The Stability ◽

The Impact

Conservation agriculture has three main pillars, i.e., minimum tillage, permanent soil cover, and crop rotation. Covering the soil surface with plant residues and minimum mechanical soil disturbance can all result from introducing a strip-till one-pass (ST-OP) system. The aim of this study was to determine the impact of the ST-OP technology on the management of plant residues, soil properties, inputs, and emissions related to crop cultivation. We compared the effect of a ST-OP system against conventional tillage (CT) using a plough, and against reduced, non-ploughing tillage (RT). Four field experiments were conducted for evaluating the covering of soil with plant residues of the previous crop, soil loss on a slope exposed to surface soil runoff, soil structure and aggregate stability, occurrence of soil organisms and glomalin content, soil moisture and soil water reserve during plant sowing, labour and fuel inputs, and CO2 emissions. After sowing plants using ST-OP, 62.7–82.0% of plant residues remained on the soil surface, depending on the previous crop and row spacing. As compared with CT, the ST-OP system increased the stability of soil aggregates of 0.25–2.0 mm diameter by 12.7%, glomalin content by 0.08 g·kg−1, weight of earthworms five-fold, bacteria and fungi counts, and moisture content in the soil; meanwhile, it decreased soil loss by 2.57–6.36 t·ha−1 year−1, labour input by 114–152 min·ha−1, fuel consumption by 35.9–45.8 l·ha−1, and CO2 emissions by 98.7–125.9 kg·ha−1. Significant favourable changes, as compared with reduced tillage (RT), were also found with respect to the stability index of aggregates of 2.0–10.0 mm diameter, the number and weight of earthworms, as well as bacteria and fungi counts.

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