Abstract
Abstract The aim of this study was to evaluate the effect of moisture on N and P uptake of cabbage (Brassica oleracea L., var. capitata) and to determine whether relative growth rate (μ) is correlated to either the concentration of N (NP), P (PP), or their ratio (NP:PP) in shoots. Seedlings were transplanted and exposed to different levels of moisture, N and P under controlled conditions. μ, leaf area, NP, and PP were determined and the relationship between μ and NP, PP, and NP:PP were examined using generalized linear models. Increased moisture levels enhanced the uptake of both N and P. A larger N supply increased μ and NP but tended to decrease PP, whereas a larger P supply increased PP but had little effect on μ and NP. NP:PP could be predicted from individual N and P supply or from their ratio. The regulatory coefficient (H value) of cabbage seedlings, expressing the extent of homeostasis, was estimated as 4.10, which is relatively high among herbaceous plants. μ and NP were highly correlated, whereas PP and NP:PP did not show a significant relationship to μ. We concluded that nutrient uptake can be enhanced by moisture management, and that μ is highly correlated to NP while there was a weak relationship between μ and NP:PP in cabbage seedlings because of the relatively strong homeostasis.
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