Effect of Seedling Age and Density on Growth and Yield of Rice in Saline Soil
ABSTRACT Two field experiments were carried out in saline soil receiving fertilizers NPK @ 130-75-75 kg ha-1, respectively, to see the effect of seedling age and number of seedling hill-1 on rice growth and yield. Rice seedlings of 25-, 35- and 55-day-old were transplanted in puddled field. Results revealed that seedlings of 25- to 35-day-old produced significantly higher number of tillers and productive tillers hill-1, paddy and straw yields compared with 55-day-old seedlings. In the second experiment, transplanting of two and three seedlings hill-1 of 35-day-old gave more promising results compared with one and four seedlings. Two seedlings hill-1 caused maximum increase in plant height, straw and paddy yield while more number of tillers and productive tillers were recorded with three seedlings hill-1.
- SourceAvailable from: Rakesh Kumar Singh[Show abstract] [Hide abstract]
ABSTRACT: Salinity tolerance in rice varies with the state of growth, with the seedling and reproductive stages being the most sensitive. However, association between tolerances at the two stages is poor, suggesting that they are regulated by different processes and genes. Tolerance at the reproductive stage is the most crucial as it determines grain yield. An F2 mapping population was developed from two rice genotypes contrasting in tolerance: Cheriviruppu and Pusa Basmati 1 (PB1). Cheriviruppu is highly tolerant at the reproductive stage, while PB1 is highly sensitive at both seedling and reproductive stages. One hundred and thirty-one microsatellite markers polymorphic between the parents were used to construct a linkage map of 1458.5 cM (Kosambi), with a mean intermarker distance of 11.1 cM. Sixteen QTLs with LOD values ranging from 3.2 to 22.3 were identified on chromosomes 1, 7, 8 and 10, explaining 4–47 % of the phenotypic variation. The maximum number of QTL clusters for different component traits was colocalized on the long arm of chromosome 1 and chromosome 7. We identified several significant epistatic interactions, including three inter-QTL interactions, using MapManager. The results suggest that pollen fertility, Na+ concentration and Na/K ratio in the flag leaf are the most important mechanisms controlling salt tolerance at the reproductive stage in rice. The study reports the construction of a genetic map for reproductive-stage salt tolerance in rice and demonstrates its utility for molecular mapping of QTLs controlling salinity tolerance-related traits, which will be useful in marker-assisted selection in the future.Journal of Agronomy and Crop Science 07/2014; · 2.62 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: The present study was conducted at the Agronomy Field, Sher-e-Bangla Agricultural University (SAU), during boro season (November 2010 to April 2011) to investigate the influence of population density on growth and yield of inbred and hybrid boro rice. The treatments consisted of four varieties viz., BRRI Dhan 28, BRRI dhan 29, BRRI Hybrid Dhan 2 and ACI Hybrid Dhan 2 and four population density viz. 1, 2, 3 and 4 seedlings hill -1Indian Journal of Agronomy 12/2014;
- Journal of Rice Research. 09/2013; 1(2):109.