CCA Exam 2023 with 100% correct answers

What process causes a plant to fix nitrogen? Rhizobium bacteria infects plant root and forms nodule Legumes and Rhizobium bacteria have what kind of relationship? Symbiotic How much nitrogen does alfalfa fix? 250 How much nitrogen does sweet clover fix? 170 How much nitrogen does red clover fix? 150 How much nitrogen does soybean fix? 100 How much nitrogen does hairy vetch fix? 70 How much nitrogen do field peas fix? 50 After a field is planted with a legume, a grass species is planted such as corn, grain sorghum, or other small grains. How much nitrogen is needed for a credit from the legume species? Half of what it fixes annually What factors limit nitrogen fixing of legumes? Soil pH, Temp, soil aeration, photosynthetic rate, soil fertility, high nitrogen in soil What is the optimum range for soil pH to fix the most Nitrogen? 5.5 to 7 What is the optimum range for temperature to fix the most Nitrogen? 65 to 82 What are the temp limits to fixing nitrogen? 32 to 112 Do legumes fix more nitrogen with sunny or cloudy days? Sunny What essential element is most essential to converting elemental nitrogen to ammonia nitrogen? Molybdenum Nebraska soil normally contains enough molybdenum for plants, what can limit this and how can it be fixed? Acid soils and liming