Table 6.

Duration of experiment and developmental stages reached before at least one root of various plant species reach the bottom of RhizoTube

Species	Number of days since sowing before at least one root reaches the bottom of the RhizoTube	Sum of degree days (base 0) since germination	Developmental stage
Trigonella foenum-graecum	42 ± 3.64	888	6.1
Vicia faba	46 ± 3.02	978	10.9
Phaseolus vulgaris L.	43 ± 1.41	911	7.0
Lens culinari	36 ± 4.63	755	14.1
Lupinus Albus L.	30 ± 2.26	639	8.6
Hordeum vulgare	22 ± 0.5	488	2.8
Brassica napus L.	30 ± 2.5	623	8.5
Pisum Sativum L.	35 ± 3.15	755	11.7
Cicer arietinum	32 ± 3.18	685	14.2
Glycine max	33 ± 3.81	700	6.3
Vicia sativa	35 ± 4.48	751	16.8
Vicia narbonensis L.	37 ± 5.61	794	8.9

Plant species were sown and cultivated in RhizoTubes using optimum nutrient solution to evaluate the time (in days or degree days) and developmental stage when at least one root reached the RhizoTube bottom. Value are expressed as mean value ± S.E., n = 5