In the description of the root system structure of jatropha
plants made by Reubens et al. [21], the plant develops a tap
root and four symmetrical lateral roots; the lateral roots grow
horizontally to some extent, and then penetrate deeper in the soil. Part of the drought tolerance claimed for J. curcas depend
on a root system able to uptake water deep in the soil [21].
Plants originated from direct seeding were able to develop
a vigorous tap root (Fig. 3A). Those propagated by stem
cuttings (Fig. 3B) did not develop a tap root, but only lateral
and superficial structures. For that reason, trees propagated
by stem cuttings will probably have reduced capacity for
exploring deep layers of soil for water and nutrients, and the
shallow root system would offer less anchoring. Heller [1]
suggested that plants propagated by stem cuttings are more
competitive for nutrients in intercropping systems because
they have more lateral roots than those from direct seeding.
Kochhar et al. [10] observed that plants propagated by stem cuttings were able to grow faster and produce more fruits in
the first year than those propagated by seeds. As roots are
a reduced sink in plants originating from stem cuttings, more
carbohydrates are available for shoot growth and fruits
production
In the description of the root system structure of jatrophaplants made by Reubens et al. [21], the plant develops a taproot and four symmetrical lateral roots; the lateral roots growhorizontally to some extent, and then penetrate deeper in the soil. Part of the drought tolerance claimed for J. curcas dependon a root system able to uptake water deep in the soil [21].Plants originated from direct seeding were able to developa vigorous tap root (Fig. 3A). Those propagated by stemcuttings (Fig. 3B) did not develop a tap root, but only lateraland superficial structures. For that reason, trees propagatedby stem cuttings will probably have reduced capacity forexploring deep layers of soil for water and nutrients, and theshallow root system would offer less anchoring. Heller [1]suggested that plants propagated by stem cuttings are morecompetitive for nutrients in intercropping systems becausethey have more lateral roots than those from direct seeding.Kochhar et al. [10] observed that plants propagated by stem cuttings were able to grow faster and produce more fruits inthe first year than those propagated by seeds. As roots area reduced sink in plants originating from stem cuttings, morecarbohydrates are available for shoot growth and fruitsproduction
การแปล กรุณารอสักครู่..
