Date Palm Root System My quest to learn more about palms brought me to this: Date Palm Anatomy   Palm Root System: All date palm roots present pneumatics,головоломка 2 полный фильммультфильм головоломка 2 смотреть онлайнмультик головоломка 2 смотреть онлайнголоволомка 2 смотреть бесплатноголоволомка 2 смотреть онлайн бесплатноголоволомка 2 онлайн бесплатноголоволомка 2 рутубголоволомка смотреть онлайн 2 which are respiratory organs. Roots are found as far as 25 m from the palm and deeper than 6 m, but 85 percent of the roots are distributed in the zone of 2 m deep and 2 m on both lateral sides in a deep loamy soil (Munier, 1973). It is worth mentioning that date roots can withstand wet soil for many months, but if such conditions spread over longer periods, they become harmful to the health of the roots and to fruit production. Figure 1 diagrammatically shows a date palm's construction with its root system. From Figure 1, it is clear that the date palm root system is divided into four zones (Oihabi, 1991): - Zone I, called respiratory zone: It is localised at the palm base's surrounding area with no more than 25 cm depth and a lateral distribution of a maximum of 0.5 m away from the stipe. Found in this zone are mainly roots of primary and secondary nature. Most of these roots have a negative geotropism and play a respiratory role.

- Zone II, called nutritional zone: It is a large zone and contains the highest proportion of primary and secondary roots. It could contain 1000 roots per m² and more than 1.60 gm of roots/100 три кота онлайн бесплатно3 кота смотреть онлайн бесплатнотри кота мультфильм смотреть онлайнтри котата мультсериал3 кота мультфильмытри кота сериал gm soil (Oihabi, 1991). They develop between 0.90 and 1.50 m depth and could laterally be found outside of the projection of the tree's canopy. In the case of Deglet Nour variety, lateral roots were found up to 10.5 m from the trunk (Bliss, 1944). Recently planted offshoots develop their roots at zone II then at zone III. At one year old, they could reach 1 m, while 3 m depth is easily reached at the second year. - Zone III, called absorbing zone: The importance of this zone is dependent on the type of culture and on the depth of underground water. It is usually found at a depth of 1.5 to 1.8 m. Mostly primary roots with a decreasing density from зрелые сиськи top to bottom are found here. The density of this zone is lower than in zone II - only about 200 roots are found per m². - Zone IV: The largest portion of this zone is dependent on underground water. At a shallower depth, it becomes difficult to distinguish between Zone III and Zone IV as both types of roots are found here. When the underground water is deep, roots of this zone could reach a greater depth. They usually are presented as vaissels with a positive geotropism. In conclusion, the root type and distribution illustrate the role of the date palm. The lack of roots in the top soil allows other cultures such as wheat, lucerne and vegetables to be inter-cropped. While, the high concentration and deep presence of primary roots allows the date palm to benefit from underground moisture and consequently, unlike most fruit palms, resist water stress and drought conditions.