Crop rotations, tillage practices and frequency of nitrogen fertilizer application - effects on soil moisture and crop yield on a vertisol in Jordan
Ankeer, A.; Battikhi, A.M.; Khattari, S.K.
Dirasat Agricultural Sciences 24(2): 224-233
A study was carried out at Mushaqqar Agricultural Research Station located in the central region of Jordan. The objectives were to study and compare three crop rotations: Duck foot fallow-wheat; chemical fallow-wheat; and wheat-wheat, on soil moisture conservation and storage and on wheat yield in a Vertisol. Also intended in this study, were to compare soil moisture conservation and wheat yield under different tillage practices, and to study the effect of splitting the recommended amounts of nitrogen fertilizer into one, two, and three doses. Results indicated that, duck foot fallow rotation conserves more soil moisture when compared to the chemical fallow rotation and the continuous wheat rotation. Wheat yield was higher after the duck foot fallow and chemical fallow when compared to the continuous wheat rotation. Results have also indicated that for continuous wheat rotation, moldboard plow resulted in significantly higher soil moisture storage from rainfall and rainfall storage efficiency, than chisel plow in the relatively high rainfall season (1991/1992). For the three rotations, the addition of nitrogen fertilizers in one split (at planting), two splits (at planting and at the tillering stage), and three splits (at planting, tillering stage, and booting stage) resulted in no significant differences regarding all parameters tested.