| Random assignment of subjects to groups |
MIND#2 |
Protocolo |
Diseño experimental |
Group assignment was based on subjects' preferences |
Assignment to groups was randomized |
Mitigating selection and allocation bias and avoiding limitations of statistical analysis |
| Increased duration of the treatment |
MIND#2 |
Operacionalización |
Tratamiento |
The treatment was applied for 4 weeks, 4 days a week, in 10-minute sessions |
The treatment was applied for 6 weeks, 4 days a week, in 12-minute sessions |
Increasing the effect of the treatment |
| Null treatment of the control group |
MIND#2 |
Operacionalización |
Tratamiento |
The control group received a placebo treatment consisting of a public speaking workshop |
The control group received no treatment, as the public speaking workshop was postponed after the second task |
Mitigating the potential distorting factor of placebo on experimental results |
| Changing the order of conceptual modelling exercises |
MIND#3 |
Protocolo |
Diseño experimental |
The order in which the exercises were carried out was ERASMUS and then EoDP |
The order in which the exercises were carried out was EoDP and then ERASMUS |
To study the potential impact of the conceptual modelling exercise on experimental results |
| Greenhouse cultivation |
Soil-2018 |
Contexto |
Medium |
The experiment was carried out in a culture chamber |
The experiment was carried out in a greenhouse |
Simulate natural conditions. |
| Only mustard is grown |
Soil-2018 |
Protocolo |
Instrumentos de medida |
Two plants were used: barley and mustard. |
Only the mustard plant was used. |
Use the plant with the highest Cu phytoextraction capacity. |
| Only Constantina soil is used |
Soil-2018 |
Población |
Type of soil |
Two soil types were sampled: Coria (pH=7.8) and Constantina (pH=5.5). |
Soil samples were taken only from Constantina. |
Use a soil from which the metal can be extracted. In the soil of Coria Cu is strongly absorbed and cannot be phytoextracted. |
| Cu dose reduction |
Soil-2018 |
Operacionalización |
Tratamiento |
The doses of Cu added to the soils were 0, 500 and 1000 mg/kg |
The doses of Cu added to the soils were 0, 125, 250 and 500 mg/kg |
Avoiding toxic levels of Cu for the plants |
| Cu applied as Cu sulphate |
Soil-2018 |
Operacionalización |
Tratamiento |
Cu was applied as Cu nitrate. |
Cu was applied as Cu Sulphate. |
Use the most accessible reagent. |
| Reduction of soil ageing time |
Soil-2018 |
Operacionalización |
Tratamiento |
Soil ageing time (from Cu application to sowing) was 45 days. |
The ageing time was 15 days. |
Avoid excessive fixation of Cu to the soil which hinders its phytoextraction. |
