Abstract
In production of fiber from jute and its similar crops using the decorticator to their preparation seems to be available to save labor and fertilizer. Then, we experimented to obtain the basic data between content of nutrients from different parts of plant body and the amount of these elements to be lost in water retting.
Results of this experiments are summarized as follows:
(1) About 23, 000 kg of fresh weight of jute plants without roots per ha, are harvested that is caliculated as dry matter of 4, 000 kg at harvest period. Plant dry matter consists of 25% of leaves, 42% of pith with xylem, 17% of fiber and nonfibrous part of skin in respectively.
(2) Concerning to these nutrients in plant from the point of dry matter, it is recognized that N and P2O5are distributed in great part of leaves, secondly nonfibrous part of skin, pith with xylem and then fiber in respectively. And K2O are highly distributed in nonfibrous part of pith with xylem, secondly next tendency is recognized: leaves>pith with xylem>fiber.
(3) Amount of N removed by jute plant from soil is about 58kg, 12kg of P2O5 and 130kg of K2O per ha. and each amount of N and P2O5 contained in leaves are estimated about 50% and 41% of K2O are in pith with xylem.
(4) It is considered that recovery of fertilizer element makes a difference by method of fiber preparation. When the stalks without leaves are retted in water, it is recovered about 50-60% of N and 30 % of K2O from the defoliated leaves before retting.
In this way, if pith with xylem are used as manure, each rate of recovery of N and P2O5 may become further to increase about 80% and about 70 % of K2O. On the other hand, when decorticated skin by machine is retted in water, N and P2O5may be recovered about 90% and 85% of K2O in respectively. And also, as the jute plant body are crushed by decoricator, the pith with xylem may become easier to ferment and useful for manure.
