Explore common crop growth challenges that farmers face, from soil issues to environmental stressors. Understand the factors affecting healthy plant development in agriculture.
A farmer notices yellowing leaves on corn plants, with the older leaves affected first. Which nutrient deficiency is likely responsible?
Explanation: Nitrogen deficiency typically causes yellowing (chlorosis) of older leaves first because nitrogen is mobile within the plant. Calcium and zinc deficiencies show different symptoms, often affecting younger leaves. Magnesium deficiency also causes yellowing but usually starts with interveinal chlorosis rather than whole leaf yellowing.
What is a likely consequence if a farmer grows blueberries in soil with a pH above 7.0?
Explanation: Blueberries prefer acidic soils, and high pH can limit nutrient availability, leading to stunted growth. Rapid flowering and enhanced fruit size are unlikely; increased pest resistance is not typically linked to high pH.
After heavy rains, a field remains saturated with water for several days and young wheat plants start wilting. What is the primary reason for this symptom?
Explanation: Waterlogged soils prevent roots from getting enough oxygen, causing wilting and growth setbacks. Excess nitrogen typically causes lush, not wilted, growth; sunlight exposure and seed quality don't directly cause sudden wilting after rain.
A soybean field shows stunted plants with spots on leaves during a humid period. Which factor most likely contributed to disease development?
Explanation: High humidity encourages fungal and bacterial diseases that cause leaf spots. Low soil temperature slows growth but doesn't directly cause spots, minimal sunlight affects growth but not specific disease risk, and low plant density usually improves air circulation, reducing disease.
A vegetable garden is heavily infested with weeds, leading to smaller carrot harvests. What is the main way weeds reduce crop yields?
Explanation: Weeds reduce crop yields by competing for essential resources like nutrients, water, and light. They typically do not provide beneficial insects, increase pollination, or consistently reduce soil erosion to offset their negative impacts on crops.