Claim · model-written summary
The most sensitive species tolerated Zn additions of 200 to 300 ppm before undergoing a significant yield decrease.
Verbatim
e0“The most sensitive species tolerated Zn additions of 200 to 300 ppm before undergoing a significant YD”
Title
Crop Response to Excessive Zinc Fertilization of Alkaline Soil1
Louis C. Boawn; P. E. Rasmussen Agronomy Journal 1971. doi:10.2134/agronj1971.00021962006300060015x
Other claims from this paper (7)
- Intervention effect Grass species were the most sensitive to added soil Zn, with maximum dry matter yield decreases greater than 40%.
- Intervention effect Alfalfa, Alaska pea, tomato, lettuce, spinach and sugarbeet had dry matter yield decreases between 20 and 40% under added soil Zn.
- Intervention effect Field bean, snap bean, russet potato, white potato, clover and Perfection pea did not undergo a significant dry matter yield decrease under added soil Zn.
- Observation Zn concentration in tops associated with a 20% yield decrease was 240 ppm for field bean.
- Observation Zn concentration in tops associated with a 20% yield decrease was 740 ppm for sugarbeet.
- Observation For most crops, Zn concentration in tops associated with a 20% yield decrease fell in a 400 to 600 ppm range.
- Observation Crops with a significant yield decrease from excess Zn were stunted but showed no discoloration, malformation or necrosis indicative of direct metal toxicity.