Root length

Fig. 5. Spatial distribution of net osmoticum deposition rate per mm root length in the apical 10 mm of maize primary roots growing at various vermiculite water contents (see Fig. 3). The data were computed from distributions of growth rate and osmotic potential (Fig. 4), as described by Silk et al. (1986). The inset shows the total osmoticum deposition rate in the apical 9 mm for the different treatments, calculated by integrating the rates over distance. Modified from Sharp et al. (1989).

A single average root radius could approximate the radius of the roots for the entire experimental period. To calculate this radius, the total root length and the total root weight at harvest were measured. The latter was converted into a root volume, V and the equation below applied ... 

Figure 16 Cumulative phosphorus uptake curves (per unit root length) predicted for two tomato cultivars Knox and C37 ) grown in a soil fertilised to two P-levels. (From Ref. 28.)...

J. G. Xu and N. G. Juma, Relations of shoot C, root C and root length with root-released C of two barley cultivars and the decomposition of root-released C in soil. 

Figure 1. Mean root length in mm of lettuce seedlings at various concentrations of Acroptilin.

Five ml aliquots of leachate or extract were pipetted onto 3 sheets of germination paper in a petri dish. Twenty five tomato or radish seeds were placed in each dish. Each treatment/seed combination was replicated five times. The assays were incubated at 20°C radish roots length was measured at 96 hrs and tomato at 168 hrs. 

Root elongation bloassay of root exudates. Five ml aliquots of the root exudates were pipetted onto three layers of Anchor1 germination paper In a 10 by 10 by 1.5 cm plastic petri dish. Twenty five radish or tomato seeds were placed in a 5x5 array in each petri dish. Radish seeds were incubated at 20C for 96 hours tomato seeds were incubated at 20C for 168 hours, before the root length was measured. Experimental design was a completely randomized design with three replications (dishes) per treatment per bioassay seed species. The bioassay was repeated each week for 23 weeks. 

Root Exudates 23 Week Mean Root Length (mm) U... 

Rye Mulch Studies. Extraction of the dried aqueous extract (Figure 1) with methanol gave a preparation which showed the greatest activity, giving 58, 80 and 86% inhibition of C. album hypocotyl length, root length and germination, respectively (data not shown). Therefore, methanol was used for all subsequent transfers. 

Figure 4. The effect of DL-B-hydroxybutyric acid (BHBA) and L-8" phenyllactic acid (BPLA) on C. album root length (RL).

Germination (%) Root Length (cm) Germination (%) Root Length (cm)... 

It seems most likely that the presence of the styrene compound was at least partially responsible for the inhibition of prickly sida germination and root length, since ferulic acid alone (prickly sida seed without carpels plus ferulic acid) had no effect on prickly sida germination or root length (Table XI). The decarboxylation of phenolic acids to corresponding styrenes is known from studies on fungi and bacteria (60, 61). However, in a number of studies directly concerned with the microbial decomposition of ferulic acid, as well as other phenolic acids, no mention is made of any styrene compounds produced as a result of phenolic acid decarboxylation (62, 63, 64, 65). 

Root length Germination Root length Germination... 

Both root and leaf leachates reduced germination of birdsfoot trefoil seeds. The root lengths of rape seedlings were reduced by all concentrations of leachate from fescue roots and leaves. As the concentrations of fescue leachate increased, root growth of rape was reduced. The leachate had no significant effect on the root length of birdsfoot trefoil roots. 

Extract Germinations Root length Hypocotyl length... 

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