ISHS Acta Horticulturae 777: IX International Rubus and Ribes Symposium
DO DIFFERENCES IN FLORICANE AND PRIMOCANE GROWTH CHARACTERISTICS OF RASPBERRY CULTIVARS INFLUENCE THE RECYCLING OF NITROGEN IN THE SOIL-PLANT SYSTEM? |
| Authors: | C.G. Kowalenko, C. Kempler, S. Bittman |
| Keywords: | nitrogen concentration, biomass nitrogen, C:N ratio, recycling, cultivar effects |
| Abstract:
Nitrogen (N) is important for sustained production of raspberries. Inorganic (e.g., commercial) and organic (e.g., manure, compost) applications are common, often resulting in applications of N in excess to that required by the plant for intensive production situations resulting in pollution of groundwater with nitrate. During the development of a simulation model for evaluating N use for raspberry production, data for the N content of dormant cane materials were not available. Floricane materials and primocane prunings are often chopped and returned to the soil. Dormant-cane material was sampled in a cultivar breeding trial plot. The amount of the various materials and their N and carbon (C) concentrations differed among cane types (floricane stems and laterals, and primocanes) and cultivars. The C:N ratio of some of these components was quite high (>130), which would likely cause at least temporary immobilization of inorganic N by microbes in the soil and reduce N that is available to the plant. The implications of the amount and quality of dormant cane materials of different cultivars to N cycling in raspberry require the assessment of the interaction of soil transformation and plant uptake processes such as the application of simulation models. This understanding is necessary for the development of N management practices that balance sustained high yields while minimizing nitrate pollution potential. | |
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