Canopy and Micronutrient Management of Thailand ber (Ziziphus mauritiana Lamk.)
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Date
2022
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Abstract
The present experiment on “Canopy and micronutrient management of Thailand
ber (Ziziphus mauritiana Lamk.)” was carried out for two successive years during 2020-
21 and 2021-22 in the farmer‟s field at Pundibari village, Dompara, Bongaigaon with
the objective to standardize the pruning height and to find out optimum doses of boron
and zinc. The experiment was laid out in factorial Randomized Block Design with 3
factors viz. variety, pruning height and micronutrient sprays with three replications and
the data of individual years were subjected to pooled analysis. The varieties V1 (Round
green type) and V2 (Roundish ovate reddish type) were pruned at height P1 (50 cm from
ground level) and P2 (75 cm from ground level). A total of nine micronutrients
treatment were given i.e. N0 (control), N1 (Borax 0.4%), N2 (Borax 0.5%), N3 (ZnSO4
0.4%), N4 (ZnSO4 0.5%), N5 (Borax 0.4% + ZnSO4 0.4%), N6 (Borax 0.4% + ZnSO4
0.5%), N7 (Borax 0.5% + ZnSO4 0.4%) and N8 (Borax 0.5% + ZnSO4 0.5%).
The plant height was not influenced by any of the treatments. The variety V1
(Round green type) recorded the earliest flowering (121.25 days), heavier fruits (35.49
g) leading to higher yield per plant (31.17 kg) although the variety V2 (Roundish ovate
reddish type) exhibited better fruit quality, viz., the highest TSS (15.00 oBrix), total
sugar (15.14%), reducing sugar (8.08%), carotenoid (0.33 μg/g), vitamin C content
(68.49 mg/100 g) and DPPH scavenging ability (9.96%). Pruning at 75 cm above
ground level (P2) resulted in more number of primary branches (8.28) leading to more
fruits (148.90/branch) and better quality fruits in terms of size, TSS, total sugar,
reducing sugar, carotenoid content and the lowest titratable acidity. Among the
micronutrient sprays, borax 0.5 per cent along with zinc sulphate 0.5 per cent (N8) was
most effective with respect to fruit retention (56.65%), more fruits per branch (146.90)
and better quality fruits. The N8 treatment favourably influenced the TSS, total and
reducing sugars, titratable acidity and total leaf chlorophyll content.
The interaction of three factors revealed that V1P2N3 was better for number of
primary branches, while V2P1N4 recorded the highest DPPH scavenging ability
(10.05%). Although V2P2N8 (Roundish ovate reddish type variety, pruning at 75 cm
from ground level, Borax 0.5% + ZnSO4 0.5% spray) registered the maximum number
of fruits (181.24/branch), the highest fruit yield (85.18 t/ha) was obtained in the
treatment V1P2N8 (Round green type variety, pruning at 75 cm from ground level,
Borax 0.5% + ZnSO4 0.5% spray) owing to differences in fruit size. The treatment
combination V2P2N8 was registered to be better in vitamin C content (70.28 mg/100 g)
and other quality parameters along with total leaf chlorophyll content (4.32 mg/g FW).
Computation of production economics revealed the B:C ratio to be the highest in
V2P2N8 (7.36), followed by V2P2N7 (7.08).