Root-growth Characteristics Contributing to Genotypic Variation in Nitrogen Efficiency of Bottle Gourd and Rootstock Potential for Watermelon.

The variations among genotypes and the growth response to supplied N, i.e., the interaction between N supply and genotypes were also highly significant ( p < 0.001) in shoot dry matter, shoot N uptake, shoot N concentration, total leaf area, photosynthesis and leaf nitrate reductase (NRA) activity ( Table 1 , Figure 1 and Figure 2 ) The variation among genotypes was usually significant, but smaller at low than high N condition.

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