1986). Strip cropping corn and grain legumes: A review.Abstract. Multiple cropping systems are prevalent in many parts of the world, and alternating strips of corn and soybeans or dry beans have been used by farmers in the temperate region. Strip cropping has the potential to reduce erosion on hilly lands, to allow a crop rotation in the field if strips are changed from one season to the next, and to increase total system yields. Results from several experiments in Eastern and Midwest U.S. show considerable variation in production among years and locations. Corn grown in narrow strips has yielded from 10 to 40 percent over sole cropping, while soybeans or dry beans in narrow strips suffer yield reductions of 10 to 30 percent due to light, water and nutrient competition. There has been no definitive research to quantify the relative importance of these factors in the competitive interface between corn and legume rows. With wider strips there is less increase in corn yields and less reduction in legume yields compared to sole cropping. Changes in component crop yields also depend on rainfall, and may be influenced by the variety of each component crop and by the width of strips. Rarely does total yield in a strip crop system fall below the average monoculture performance. In years of adequate rainfall, production of strip crops may outyield sole crops by 10 to 20 percent. Potential production of strip cropping systems is reviewed, and projected soil conservation is estimated using the Universal Soil Loss Equation.
Corn (Zea mays L.) usually yields more when rotated with soybean [Glycine max (L.) Merr.] than when grown continuously. The exact reason for this yield increase in unknown. One objective of this study was to determine whether the increase in rotated corn yield is due to a positive influence of the soybean or to the absence of a negative influence of continuous corn. An alternate year of fallow was compared to an alternate year of soybean to determine which was more effective in alleviating the yield reduction associated with continuous corn. A second objective was to determine if an application of triacontanol (no chemical name available) (TRIA, reported to be present in soybean residue, and to enhance the growth and yield of corn) might alleviate the yield reduction associated with growing corn continuously. Each treatment consisted of a 3‐yr cropping sequence. Corn was the crop during the first and third years. During the second or alternate year, the plots were maintained in corn, soybean, or fallow. In one series maintained in corn, the crop was treated with TRIA during the seedling stage of the third year. Corn yielded significantly better and equally well when rotated with either soybean or fallow. TRIA had no effect on corn grain yields. It appears that improved grain yields when corn is rotated with soybean are not due to the presence of TRIA or any growth promoting influence left over from the soybean. Rather, the yield increase must be due to the absence of some negative effect that otherwise persists in the soil when corn is grown continuously.
Summary Low levels of potassium (K+) nutrition resulted in a decrease in dry wt of leaves, stems and roots of two contrasting bean cultivars, Michelite (M‐62) and Redkote (RK). A decrease in eel! size and compaction of cells per unit area, resulting in decreased leaf thickness, and degradation of chloroplasts, and loss of cell wall integrity accompanied the decrease in percent K+ of leaf tissue. Net photosynthesis rate decreased below a threshold level of about 1% K+ in the leaf tissue with corresponding nutrient solution levels of between 1·2 and 0·3 mequiv. K+1‐1. Below this critical level, both stomatal and mesophyll diffusion resistances to CO2 increased markedly. Varietal differences for these responses suggests differences in efficient utilization of the element rather than differential ability to absorb K+.
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