Quality differences between organic and conventional field grown vegetables – experiences from a Swedish long-term field trial

2019 ◽  
pp. 65-68
Author(s):  
L. Mogren ◽  
P. Modig ◽  
A. Gunnarsson
Keyword(s):  
Field Trial ◽  
Conventional Field ◽  
Term Field

scholarly journals Discrimination of conventional and organic white cabbage from a long-term field trial study using untargeted LC-MS-based metabolomics

2014 ◽  
Vol 406 (12) ◽  
pp. 2885-2897 ◽  
Author(s):  
Axel Mie ◽  
Kristian Holst Laursen ◽  
K. Magnus Åberg ◽  
Jenny Forshed ◽  
Anna Lindahl ◽  
...  
Keyword(s):  
Field Trial ◽  
White Cabbage ◽  
Term Field

Changes in soil biological and biochemical characteristics in a long-term field trial on a sub-tropical inceptisol

2006 ◽  
Vol 38 (7) ◽  
pp. 1577-1582 ◽  
Author(s):  
R. Ebhin Masto ◽  
P.K. Chhonkar ◽  
Dhyan Singh ◽  
A.K. Patra
Keyword(s):  
Field Trial ◽  
Biochemical Characteristics ◽  
Term Field

Long-Term Field Trial to Control the Invasive Argentine Ant (Hymenoptera: Formicidae) With Synthetic Trail Pheromone

2010 ◽  
Vol 103 (5) ◽  
pp. 1784-1789 ◽  
Author(s):  
K. Nishisue ◽  
E. Sunamura ◽  
Y. Tanaka ◽  
H. Sakamoto ◽  
S. Suzuki ◽  
...  
Keyword(s):  
Field Trial ◽  
Trail Pheromone ◽  
Argentine Ant ◽  
Term Field

scholarly journals COCOA AND TOTAL SYSTEM YIELDS OF ORGANIC AND CONVENTIONAL AGROFORESTRY VS. MONOCULTURE SYSTEMS IN A LONG-TERM FIELD TRIAL IN BOLIVIA

2016 ◽  
Vol 53 (3) ◽  
pp. 351-374 ◽  
Author(s):  
M. SCHNEIDER ◽  
C. ANDRES ◽  
G. TRUJILLO ◽  
F. ALCON ◽  
P. AMURRIO ◽  
...  
Keyword(s):  
Field Trial ◽  
Production Systems ◽  
Management Practice ◽  
Block Design ◽  
Agroforestry Systems ◽  
Total System ◽  
Cocoa Production ◽  
Faster Development ◽  
Term Field

SUMMARYCocoa (Theobroma cacao L.) is produced in systems of varying complexity ranging from monoculture with temporary shade to highly diverse agroforests. Producers have to weigh high cocoa yields in the short to medium term in monocultures against higher total system yields in the short term and sustainable production systems in the long term in conjunction with ecosystem services in agroforestry systems (AFs). More long-term data on the comparative agronomic, economic and ecological performance of differently managed cocoa production systems is required to make sound recommendations to farmers. This paper describes the only long-term field trial worldwide comparing different cocoa production systems under conventional and organic management. The factors (i) crop diversity (monoculture vs. agroforestry), (ii) management practice (conventional vs. organic) and (iii) cultivar are being tested in a full-factorial, randomized complete block design with four replications. First, results showed significantly faster development of trunk circumferences in monocultures (+21%) compared to AFs. Cocoa yields were 47% lower in the organic compared to the conventional monoculture. In the AFs, however, the organic–conventional yield gap was less pronounced (−16%) and statistically insignificant. The cumulative yields of all products harvested were significantly higher in the AFs (+161%) compared to the monocultures. The productivity of cocoa by-crops in AFs may contribute to local food security and risk distribution in smallholder contexts.

scholarly journals Soil micronutrient availability to crops affected by long-term inorganic and organic fertilizer applications

2014 ◽  
Vol 60 (No. 5) ◽  
pp. 198-203 ◽  
Author(s):  
B. Rutkowska ◽  
W. Szulc ◽  
T. Sosulski ◽  
W. Stępień
Keyword(s):  
Soil Solution ◽  
Field Trial ◽  
Organic Fertilizer ◽  
Farmyard Manure ◽  
Organic Fertilization ◽  
Manure Application ◽  
Nutritional Needs ◽  
Micronutrient Availability ◽  
Term Field

The effects of mineral and organic fertilization on the contents of Fe, Cu, Zn, Mn, B and Mo in soil and in the soil solution as well as on availability of these elements for crops were investigated in the long-term field trial. The highest contents of Zn, Fe, Mn and Cu in soil and soil solution were observed in the treatment with the lowest pH (NPK). In this same combination the content of B and Mo was the lowest. The concentration of Zn, B and Fe in the soil solution significantly increased under farmyard manure application. Liming significantly decreased contents extractable by 1 mol/L HCl forms of Mn and Zn and significantly increase the content of Mo in the soil. Regardless of fertilization applied, microelement concentrations in the soil solution are sufficient for fulfilling nutritional needs of plants cultivated during the trial.

Mineral fertilizers with recycled manure boost crop yield and P balance in a long-term field trial

2020 ◽  
Vol 116 (3) ◽  
pp. 271-283 ◽  
Author(s):  
Chuanchuan Ning ◽  
Qiang Ma ◽  
Haiyan Yuan ◽  
Changrui Zhou ◽  
Zhuqing Xia ◽  
...  
Keyword(s):  
Crop Yield ◽  
Field Trial ◽  
Mineral Fertilizers ◽  
P Balance ◽  
Term Field

Fate of 15N-labelled fertilizer in a long-term field trial at Ropsley, UK

1997 ◽  
Vol 129 (1) ◽  
pp. 49-63 ◽  
Author(s):  
A. BHOGAL ◽  
S. D. YOUNG ◽  
R. SYLVESTER-BRADLEY
Keyword(s):  
Field Trial ◽  
N Uptake ◽  
Significant Loss ◽  
Growing Seasons ◽  
Large N ◽  
Long Term Effect ◽  
Added Nitrogen Interaction ◽  
Labile N ◽  
Term Field

In 1992 and 1993, eight rates of 15N-labelled fertilizer (0–245 kg ha−1) were applied to winter wheat growing on the Ropsley long term field trial where eight different N amounts had been applied annually since 1978. The fate of the labelled N in the crop and topsoil (0–23 cm) was determined at harvest in the year of 15N application and in the first and second residual years.By harvest in the second residual year, 60–77% of the original labelled application had been recovered in the crop and topsoil with 23–40% lost. These losses virtually all occurred within the first two growing seasons; there was no significant loss during the second residual year. Significant changes in the 15N balance were observed at N applications in excess of the range 140–175 kg ha−1 which suggested a marked decrease in the efficiency of N use and an increase in residual labile N in the soil at harvest. At low N applications (<175 kg ha−1), a positive added nitrogen interaction (ANI) was observed: 40–50% of this was a residual ANI due to the short or long term effect of applying N fertilizer, and the remainder was probably an apparent ANI due to pool substitution in the immobilization process. At large N applications (>175 kg ha−1) a negative ANI was observed: large N applications resulted in a net suppression of soil N uptake due to substitution by fertilizer for a limited plant N demand.

scholarly journals Long-term fertilizer field trials: comparison of three mathematical response models

1997 ◽  
Vol 6 (2) ◽  
pp. 151-160 ◽  
Author(s):  
Stefan T. Bäckman ◽  
S. Vermeulen ◽  
V.-M. Taavitsainen
Keyword(s):  
Production Function ◽  
Field Trial ◽  
Crop Production ◽  
Mineral Fertilizer ◽  
Field Trials ◽  
The European Union ◽  
Response Models ◽  
Economic Use ◽  
Term Field

Accession to the European Union caused a drop of nearly 60 per cent from 1994 to 1995 in prices of wheat, barley and oats in Finland. The economic use of fertilizer therefore decreased accordingly. To calculate the effect of the price changes on the economic optima, the physical production function must be known. Three physical production functions, the quadratic, the linear response and plateau (LRP) and the exponential function were estimated for this purpose. The models differed little in respect of the R2adj value (0.82-0.90) but the calculated optimum varied, depending on the production function. Data on a long-term field trial (21 years) were analysed. The field trial was established in 1973 to demonstrate the effect of mineral fertilizer in crop production. The crops grown in the trial were barley, wheat and oats. Different varieties were included in the models.

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