TY - JOUR AU - Aday, Shaker H. AU - Al-muthafar, Yarub PY - 2019/03/15 Y2 - 2024/03/29 TI - Comparison Study between the Field Performance of a Movable Boards and Conventional Ditch Openers in Cultivated and Uncultivated Soils, Part 3: The Specific Resistance JF - Basrah Journal of Agricultural Sciences JA - Basrah J. Agric. Sci. VL - 32 IS - 1 SE - ORIGINAL ARTICLE(S) DO - 10.37077/25200860.2019.113 UR - https://bjas.bajas.edu.iq/index.php/bjas/article/view/54 SP - 15-24 AB - <p style="text-align: justify;">The field performance of movable boards ditch opener (MB) and conventional ditch opener (CD) was contrasted by using a specific resistance to determine&nbsp; the&nbsp; optimum&nbsp; performance&nbsp; of&nbsp; either&nbsp;&nbsp; one&nbsp;&nbsp; of&nbsp;&nbsp; them.&nbsp;&nbsp; The&nbsp;&nbsp; comparison was conducted using three operating&nbsp; depths&nbsp; (30,&nbsp; 40&nbsp; and&nbsp; 50cm),&nbsp; three&nbsp; angles&nbsp; between&nbsp; the&nbsp; boards&nbsp; of&nbsp; MB&nbsp; (45,&nbsp; 60&nbsp; and&nbsp; 750),&nbsp; one&nbsp; angle&nbsp; for&nbsp; CD&nbsp; (650)&nbsp; because &nbsp;its&nbsp;boards were fixed, three wings width&nbsp; of&nbsp; the&nbsp; foot&nbsp; of&nbsp; MB&nbsp; whereas,&nbsp; for&nbsp; CD,&nbsp; one&nbsp; share width&nbsp; (35cm)&nbsp; and&nbsp; two&nbsp; soil&nbsp; types&nbsp; (cultivated&nbsp; and&nbsp; uncultivated).&nbsp; CD&nbsp; could&nbsp; not penetrate the&nbsp; uncultivated&nbsp; soil&nbsp; more&nbsp; than&nbsp; 25cm&nbsp; so&nbsp; that&nbsp; there&nbsp; was&nbsp; one&nbsp; operating&nbsp; depth.&nbsp; The&nbsp; results&nbsp; of&nbsp; the&nbsp; experiments&nbsp; showed&nbsp; that&nbsp; SR&nbsp; for&nbsp; MB&nbsp; decreased as the operating depth,&nbsp; the&nbsp; angle&nbsp; between&nbsp; the&nbsp; boards&nbsp; and&nbsp; the&nbsp; width&nbsp; of the wings of the foot&nbsp; in&nbsp; both&nbsp; soil&nbsp; types&nbsp; were&nbsp; increased.&nbsp; Specific&nbsp; resistance&nbsp; (SR)&nbsp; for&nbsp; CD &nbsp;also&nbsp; decreased&nbsp; as&nbsp; the&nbsp; operating&nbsp; depth&nbsp; increased&nbsp; in&nbsp; the&nbsp; cultivated&nbsp; soil,&nbsp;&nbsp;&nbsp; but&nbsp; in&nbsp; the&nbsp; uncultivated&nbsp; soil,&nbsp; CD&nbsp; could&nbsp; not&nbsp; penetrate&nbsp; the&nbsp; soil&nbsp; more&nbsp; than&nbsp; 25cm.&nbsp; SR for MB was&nbsp; lower&nbsp; than&nbsp; that&nbsp; for&nbsp; CD&nbsp; for&nbsp; all&nbsp; operating&nbsp; depths,&nbsp; the&nbsp; angle&nbsp; between the boards,&nbsp; the width of the wings of the foot in both soil types. SR for&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MB and CD&nbsp; in&nbsp; the&nbsp; cultivated&nbsp; soil&nbsp; was&nbsp; low&nbsp; compared&nbsp; to&nbsp; uncultivated&nbsp; soil.&nbsp; The&nbsp; soil&nbsp; type&nbsp; decreased&nbsp; SR&nbsp; for&nbsp; MB&nbsp; more&nbsp; than&nbsp; the&nbsp; operating&nbsp; depth,&nbsp; the&nbsp; angle&nbsp;&nbsp; between its boards and the width of&nbsp; its&nbsp; wings.&nbsp; On&nbsp; the&nbsp; other&nbsp; hand,&nbsp; the&nbsp; angle&nbsp; between its boards reduced&nbsp; SR&nbsp; more&nbsp; than&nbsp; the&nbsp; width&nbsp; of&nbsp; the&nbsp; wings&nbsp; and&nbsp; the&nbsp; operating depth. MB surpassed CD in giving lower SR and that means the field performance of MB was higher than that for CD.</p> ER -