CCA Exam()Questions And Answers 100% Correct!!

What process causes a plant to fix nitrogen? - ANSWERRhizobium bacteria infects plant root and forms nodule Legumes and Rhizobium bacteria have what kind of relationship? - ANSWERSymbiotic How much nitrogen does alfalfa fix? - ANSWER250 How much nitrogen does sweet clover fix? - ANSWER170 How much nitrogen does red clover fix? - ANSWER150 How much nitrogen does soybean fix? - ANSWER100 How much nitrogen does hairy vetch fix? - ANSWER70 How much nitrogen do field peas fix? - ANSWER50 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? - ANSWERHalf of what it fixes annually What factors limit nitrogen fixing of legumes? - ANSWERSoil 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? - ANSWER5.5 to 7 What is the optimum range for temperature to fix the most Nitrogen? - ANSWER65 to 82 What are the temp limits to fixing nitrogen? - ANSWER32 to 112 Do legumes fix more nitrogen with sunny or cloudy days? - ANSWERSunny What essential element is most essential to converting elemental nitrogen to ammonia nitrogen? - ANSWERMolybdenum Nebraska soil normally contains enough molybdenum for plants, what can limit this and how can it be fixed? - ANSWERAcid soils and liming