Nutrient: efficiency · Hordeum vulgare (barley)

1. nitrogenPositive and negative results13 papers: 8 positive, 5 negative or no effect
2. fertilizationPositive and negative results11 papers: 6 positive, 5 negative or no effect
3. phosphorusPositive and negative results4 papers: 3 positive, 1 negative or no effect
4. potassiumPositive and negative results2 papers: 1 positive, 1 negative or no effect
5. droughtResults agree2 papers: 0 positive, 2 negative or no effect
6. inoculationResults agree2 papers: 2 positive, 0 negative or no effect
7. irrigationResults agree2 papers: 2 positive, 0 negative or no effect
8. otherResults agree2 papers: 2 positive, 0 negative or no effect

Claims are grouped by organism, treatment and what was measured or targeted. Claims that compare genotypes are left out; a claim about lacking a nutrient counts the other way round in that nutrient’s question. “Results differ” marks a question where two model reviewers, reading both claims, accepted at least one pair of papers whose results differ.