Objective Effects of N and P additions on the growth and chlorophyll fluorescence indices of Polygonum multiflorum were studied to provide a guideline for proper fertilization to promote the plant growth.
Method N and P addition, i.e., (1) N application using 2.7g urea/plant, (2) P application using 14.4g superphosphate/plant, (3) N+P application using 2.7 g urea and 14.4 g superphosphate on each plant, or (4) control without added N or P, was incorporated in the potting soil to observe the resulting growth and chlorophyll fluorescence indices of the plants.
Result The treatments increased the leaf count, single leaf area, petiole length, and height of the plants in the order of N+P application > P application > N application > control. The addition of N+P significantly increased the biomass accumulation, proportion of above-ground biomass, and chlorophyll content as well as the indices of Fv/Fm, qP and ETR, with a decreased qN. Compared to control, N+P treatment affected the most on chlorophyll with a 96.08% increase and on qN with a 29.16% reduction.
Conclusion Addition of both N and P in the potting soil significantly promoted the growth and photosynthesis of P. multiflorum.
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