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Screening of Popcorn Lines Against Drought at Reproductive Stage

F. Ahmed
SSO
Agronomy Division, Gazipur

Abstract/ Executive Summary:

A field experiment on popcorn was conducted during rabi season of 2012-13 to find out suitable popcorn genotypes against drought. Eighteen Popcorn genotypes (L3, L4, L6, L10, L11, L12, L13, L14, L15, L16, L17, L25, L30, L39, L40, L41, L42 and L43) were evaluated under well watered and drought conditions. Drought was imposed by withdrawing of irrigation water from 75 days after sowing (DAS) to maturity. Drought enhanced crop maturity by 3 to 4 days in different genotypes but it reduced grain yield of all the genotypes. Under irrigated condition, the highest yield (72g/plant) was recorded in L41 followed by L6, L17, L39 and L4. Under drought condition, the highest yield (54 g/plant) was found in L39 followed by L41, L17, L4 and L6. However, on the basis of yield, Stress Tolerance Index (STI) and Geometric Mean Productivity (GMP); genotypes L41, L39, L17, L4, L6 and L14 found more promising against drought.

Keywords: Screening, Popcorn, Drought, Reproductive stage

Location: Joydebpur

Start Date: 27-11-2012

End Date: 19-05-2013

Program Area: Variety and Species

Commodity:

Objectives:

To find out suitable popcorn genotypes against drought.

Methodology:

The experiment was conducted at the Research field of Bangladesh Agricultural Research Institute, Joydebpur, during rabi 2012-2013. Eighteen Popcorn genotypes namely L3, L4, L6, L10, L11, L12, L13, L14, L15, L16, L17, L25, L30, L39, L40, L41, L42 and L43 were used as treatment variables. The trial was non-replicated. The unit plot size was 3 m x 2 m. Five lines (2m long) of each genotypes were sown on November 27, 2012 with 60 cm x 20 cm spacing. Fertilizers were applied at the rate of 150-48-96-30 kg/ha N, P, K and S as urea, triple super phosphate (TSP), muriate of potash (MOP) gypsum. One third of N and whole amount of TSP, MOP and gypsum were applied as basal. Remaining 2/3 N was top-dressed at 40 and 65days after sowing (DAS). Control plots were irrigated as and when required to maintain adequate soil moisture. In drought imposing plots, last irrigation was done at 72 DAS and until maturity no irrigation was applied. Soil moisture (0-30 cm and 30-60cm) was monitored by gravimetric method at 15 days interval starting from 75 DAS to maturity. Phenological data was recorded by frequent field monitoring. Maize was harvested from 142 to 153 DAS. The yield components data were collected from 5 randomly selected plants prior to harvest from each plot. At harvest, the yield data was recorded 20 plants of each genotypes and mean yield was calculated. Stress Tolerance Index (STI) and Geometric Mean Productivity (GMP) were calculated according to Fernandez (1992): STI = (Ypi × Ysi)/YP2 GMP = √ ( Ypi × Ysi) Where, YPi = yield of cultivar in normal condition, Ysi = Yield of cultivar in stress condition and YP2= Total yield mean in normal condition.

Source of Information: Annual Report, Agronomy Division 2012-2013

Article Link (Online Journal):

Funding Source:

1. Asian Development Bank

Budget: 20,000/-

Total Budget (Tk.) : 20,000/-

Achievement/Findings:

Drought enhanced crop maturity by 3 to 4 days in different genotypes but it reduced grain yield of all the genotypes. Under irrigated condition, the highest yield (72g/plant) was recorded in L41 followed by L6, L17, L39 and L4. Under drought condition, the highest yield (54 g/plant) was found in L39 followed by L41, L17, L4 and L6. However, on the basis of yield, Stress Tolerance Index (STI) and Geometric Mean Productivity (GMP); genotypes L41, L39, L17, L4, L6 and L14 found more promising against drought.

Knowledge Management: Report/Proceedings