AGRO 4052 : AGRO 4052 SPRING 2012 1st Exam
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Name: ________________________: true or false (30 points) An acidic soil that is poorly buffered would require large amount of lime to increase its ph. _______: mineralization process results in production of plant available n. Is held stronger on anion exchange site than no3. Unsatisfied charges at broken edges of clay give rise to ph dependent charge. Exchangeable acidity can be estimated if base saturation and cec is known. Urea and nitrite are forms of n which are also taken up by plants but in very small amounts. Strongly adsorbed nutrients on exchange site moves to the roots by diffusion. _______: n loss and n gain are in equilibrium under agricultural systems. _______: mineral nutrients must be in ionized state before it can be assimilated by plants. _______: soil has different components, the largest of which is humus. _______: nitrogen in oceans is less than 1% of the total n in the biosphere.
