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i~! <br />I~ <br />,7 <br />[~ <br />ILL' <br />I1 <br />7 <br />~. <br />~! <br />',. <br />.. <br />~ ~ <br />~; <br />9 <br />;4s <br />SOIL FORMATION, CLASSIFICATION, AND SURVEY Ch. I2 <br />INCREASED INTENSITY OF LAND USE <br />(L <br />Q <br />N <br />Q <br />Z <br />Q <br />to <br />Z <br />F <br />a <br />J <br />N <br />Q <br />V <br />z <br />[1 <br />O <br />w <br />6 <br />LL <br />O y <br />z w <br />Q ~ <br />Y ~ <br />r LL <br />J ~ <br />to U <br />a0 <br />a= <br />Q U <br />~ LL <br />Q () <br />W <br />Q <br />V <br />0 <br /> GRAZING CULTIVATION <br />LAND ~ A <br /> <br />CAPABILITY ~ <br />~- v <br />_ <br />w `K v <br />_ <br />` <br />c u <br />CLASS J o ~ <br />~ .E w <br />p :: d <br /> 3 LL F ~ J ~ ~ ~ <br />I ~ <br />I I - <br />III ' <br />IV <br />v <br />VI <br />VII 1;~ -..~ <br /> <br /> Shaded portion shows uses <br />VIII `t, ~,~; for which classes are suitahle <br />F t c u R E 1? :16. Intensity with which each land capability class can be used with safety. <br />Note [he increasing limitations on the uses to which the land can safely be put as one <br />moves from class 1 to class Vlll. [Afod~ed from Hockensmiih and Steele (?).] <br />or even for wildlife preserves. The sodsare deeR`well drained and the land <br />is nearly level. They are either naturally fertile or have characteristics which <br />encouraee good response of crops to applications offertilizer. <br />The water-holding capactry of soils in class I is high. In arid and semiarid <br />areas soils havine all the other favorable characteristic mentioned above <br />may be in class I if they are irrigated_by a permanent imga[ion system. <br />The soils in class I need only ordin~ crop management practices to <br />maintain their productivity. These include the use of fertilizer and Lime <br />and the rentrn of manure and crop residttes, including gzeen manures. Crop <br />rotations are also followed. <br />CLASS rt Soils in this class "have some limitations that reduce~heshoice <br />of plane or require moderate conservation practices." These soils may be <br />used for the same crops as class L However, they are capable of sustaining <br />less intensive cropping systems, or, with the same cropping systems, they <br />require some conservation practices. <br />The use of soils in class II may be limited by one or more factors, such <br />as (a) eentle slopes, .(b~ modem e~eTOSion hhazards, (c) inadequate soil <br />= - <br /> <br />.~ <br />F Ste, ]': 12 LAND CAF <br />