Following summer leaf-application 15N, the withdrawn 15N from fallen leaves shifted in trees in winter, and local withdrawn 15N remobilized in original organs during spring.
ABA root application did not affect the survival rates of wheat variety Kite and Banks, but decreased the rates of Karchyia and C-306, ABA leaf application reduced the rate of all four varieties.
0.6L/m2 Fe fertilizer increased the contents of proline, soluble carbohydrate and catalase by 25%, 310% and 180%, respectively; 0.4g/m2N + 0.6L/m2 Fe fertilizer increased the contents of proline, soluble carbohydrate and catalase by 41%, 182% and 160%, respectively and gave the best result for cold resistance of centipedegrass.
秋冬季叶施Fe、N+Fe可提高草体内抗寒指标性物质的含量,叶施0.6L/m2 Fe或4g/m2 N + 0.6L/m2 Fe,可使草坪草体内脯氨酸、可溶性糖类含量及过氧化氢酶的活性分别提高25%、310%、180%和41%、182%、160%。
5. Suppying Fe, N+Fe at autumn can improve the content of matter correlated with cold tolerance. Fe Fertilizing with concentration of 0.61/m2 or fertilize with 4g/m2 of N + 0.61/m2 of Fe can improve contents of proline, soluble carbohydrate and catalase by 25%, 310%, 180% and by 41%, 182%, 160%.
Residues of demeton on apples were studied by the cholinesterase activity inhibition method of Hestrin. Three treatments were conducted with a 50% demeton emulsifiable concentrate at a dilution of 1:1,000: (1) only the fruits on a branch were dipped in the insecticide solution; (2) branches with fruits and leaves were sprayed while the fruits were wrapped with plastic sheets; (3) a branch with fruits and leaves with the cut end set in the insecticide solution for twenty-four hours and then in water. After the...
Residues of demeton on apples were studied by the cholinesterase activity inhibition method of Hestrin. Three treatments were conducted with a 50% demeton emulsifiable concentrate at a dilution of 1:1,000: (1) only the fruits on a branch were dipped in the insecticide solution; (2) branches with fruits and leaves were sprayed while the fruits were wrapped with plastic sheets; (3) a branch with fruits and leaves with the cut end set in the insecticide solution for twenty-four hours and then in water. After the treatment the fruits were examined for demeton residues. A summary of the results is given as follows: (1) Fruits that were dipped in the demeton solution for 1 minute were found to retain a residue as high as 2 ppm and dropped to 0.75 p.p.m, after twenty-four hours. The residue gradually fell to zero within two weeks or so. (2) Within twelve days after the spraying of the leaves, residue on the fruits was not detectable. (3) Within twenty-four hours during which the branch was set in the insecticide solution, although the branch had absorbed much of the solution, no residue was detectable in the fruits. On the next day, a residue of 0.5 ppm was detected, and then it dropped to zero within ten days. It may be supposed that when demeton is applied by spraying, as generally the case, the residue may be chiefly due to the retainment of insecticide on the fruit surface, and the residue rapidly reduce below a tolerance of 0.75 ppm within a few days. The author suggests that the period between the latest application of the insecticide and the harvest time may be shortened to three or four weeks.
Non-labelled urea, 15N-labelled urea and ethephon were applied on mature and potted young jujube trees ( Zizyphus jujuba Mill. ) by spray or foliar daub in winter in 1987 and 1988.We studied the effects of leaf nitrogen return to tree after the treatments, the positions and forms of nitrogen reserved, and reutilization of storage nitrogen in the next year.The results were as follows: l.The return of leaf nitrogen was accelerated by autumn foliar urea and ethephon applied, and then the level of storage nitrogen...
Non-labelled urea, 15N-labelled urea and ethephon were applied on mature and potted young jujube trees ( Zizyphus jujuba Mill. ) by spray or foliar daub in winter in 1987 and 1988.We studied the effects of leaf nitrogen return to tree after the treatments, the positions and forms of nitrogen reserved, and reutilization of storage nitrogen in the next year.The results were as follows: l.The return of leaf nitrogen was accelerated by autumn foliar urea and ethephon applied, and then the level of storage nitrogen of trees was increased.The results of urea plus 200ppm ethephon were the best. 2 . There were significant in-creases in the length of "zaodiao" ( a kind of bearing branchlet that falls in late autumn ) , fruit set, average single fruit weight, and the amount of reducing sugar of jujube fruits.Urea also increased the nitro-gen of shoots and leaves, but decreased the amount of sucrose of fruits. 3 . The above-ground organs and roots of jujube trees were of same importance in nitrogen reserved in winter. The main form of sto-rage nitrogen was protein-nitrogen, which amount was more than 2-3 fold than non-protein nitrogen ( soluble nitrogen ) .
15N-urea was foliar applied on bearing or young jujube tree (Zizyp-hus jujuba Mill.) in autumn of 1987.The effects of leaf-nitrogen retrans-location in the trees,positions of the N stored,forms of reserved N,and reutilization of storage N in the next year were studied.The results were as follows:15N returned and stored in all parts of the tree following foliar application of 15N-urea.Root could use the nitrogen not only absorbed from soil but also transported from leaves.The above-ground organs and roots of...
15N-urea was foliar applied on bearing or young jujube tree (Zizyp-hus jujuba Mill.) in autumn of 1987.The effects of leaf-nitrogen retrans-location in the trees,positions of the N stored,forms of reserved N,and reutilization of storage N in the next year were studied.The results were as follows:15N returned and stored in all parts of the tree following foliar application of 15N-urea.Root could use the nitrogen not only absorbed from soil but also transported from leaves.The above-ground organs and roots of jujube tree played the same important roles on nitogen storage in winter.The main forms of storage nitrogen were protein-N,which was 2-3 fold more than non-protein-N.The storage nitrogen existed in above-ground parts was used first in early spring,and that returned from leaves last year could be prior used for the developments of leaves,branchlets and infloresences.The relative distribution of nitrogen in floresence was more in bearing tree than in young tree.In the next year,15N was redistributed in branchlets,leaves,flowers,young fruits and perennial spurs of the trees treated with 15N-urea on leaves of some perennial spurs in autumn.The 15N transported out of the treated spurs reappeared in next spring and further transported to neighboring spurs.The local storage N was prior used for growth.There was 21.49% of fertilizer-N stored in the young jujube trees when treated foliarly with urea in autumn of 1987.After one years's use,there was still 18.91% of fertilizer-N existed in the trees,which indicated a characteristic of circulatory utilization of nitrogen for a long period and the reutilized nitrogen was mainly from jujube leaves and deciduous branchlets.
叶施
leaf-application
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