Abstract
The present study was conducted at the Spices Research Centre, Bangladesh
Agricultural Research Institute, Shibganj, Bogura during 2015-2018 to find out the
suitable genotypes of coriander for leaf and seed production throughout the year as
well as to standardize the package of technologies for year round leaf production. In
this regard, eight experiments were conducted to achieve the objectives. All experiments
were laid out in Randomized Complete Block Design with three replications, except
experiment number eight where used in eight replications. Sixteen different coriander
genotypes (CS1, CS2, CS4, CS5, CS6, CS7, CS8, CS9, CS10, CS11, CS12, CS14, CS15,
CS16, CS17 and CS18) were evaluated in respect to leaf and seed yield. Among those
genotypes, CS11 gave the highest leaf yield (9.87t/ha) and CS4 gave the lowest leaf
yield (3.57 t/ha). The highest seed yield (1.78 t/ha) was recorded in CS15 and the
lowest seed yield (0.79 t/ha) was found in CS4. Three different groups of genotypes
were found from cluster analysis. Group I consisted only CS4 genotype and group II
thirteen genotypes (CS1, CS2, CS5, CS6, CS7, CS8, CS9, CS12, CS14, CS16, CS17 and
CS18) and group III two genotypes (CS11 and CS15). Twelve sowing times were used
to find out the leaf yield potential of the sixteen coriander genotypes. The genotype
CS11 gave the highest leaf yield (5.33 t/ha) and the highest BCR (4.22) followed by
CS15 (3.47t/ha; BCR = 2.81) and the lowest was found in CS4 (1.41t/ha; BCR=0.67). In
case of sowing time, the highest economic return observed during November to April
(BCR = 1.09-2.22) than May to September, where maximum return for leaf production
was recorded in the month of November sowing (BCR=2.22). The experiment was
conducted to assess the quality seed producibility of the same sixteen genotypes in
winter and summer season. The genotype CS15 gave the highest seed yield (0.94 t/ha)
which followed by CS11 (0.39 t/ha) and the lowest seed yield (0.59 t/ha) was found
from CS4. On the other hand, winter season gave higher seed yield (1.33 t/ha) than
summer season (0.14 t/ha). Another experiment was conducted to find out the
germination percentage and it was found that pre sowing sprouted seed gave the
highest germination percentage (79.60%) followed by mulching with gunny bag
(68.77%). In connection to the three seed rate and four row spacing were evaluated to
find out the optimum seed rate and maximum use of land. Significantly the highest leaf
yield (10.62t/ha) was obtained from 50 kg/ha seed and row to row spacing 15 cm
followed by leaf yield (10.52t/ha) from 40 kg/ha seed and row to row spacing 15 cm.
Eleven doses of manures and fertilizer were investigated to find out their economic
uses. The highest leaf yield (10.27 t/ha) was recorded from N0Pз0Кз0 and this dose was
found as optimum with conducive economic performance (BCR=2.09). Subsequently
seven different shading percentages were imposed to find out optimum one for
maximum leaf production. Attalia net which gave 40-45% shading was found the best
for growth and the highest leaf yield (6.08 t/ha) of coriander and the highest BCR
(4.70). Finally, the best performed production practices were studied combinedly to
develop a improved production technology package for coriander leaf cultivation to
increase the economic return of farmer. In this regard, it was found that improved
production technology package was performed six times higher leaf production than
the existing practices.