Effects of Growth-period Type and Nitrogen Application Level on the RVA Profile Characteristics for Japonica Rice Genotypes

SUMMARYThe effect of sowing date and nitrogen on tillering patterns, survival and contribution of reproductive tillers to grain yield of standard and Mexican wheat cultivars were studied for two seasons.Maximum number of tillers/plant, 3·2–4·5, was observed after 40 and 27 days from sowing for 1970–1 and 1971–2 respectively. The number of ears/plant was 1·4 at the end of the growing season. Varieties differed in tillering, and LRN10 and Giza 155 produced more reproductive tillers than Falchetto and Mexipak. Nitrogen application increased tillering efficiency, i.e. ratio of fertile to total tillers produced. Only 26% of tillers appearing in the axil of the first true leaf (T1) and 10% of tillers in the axil of the second true leaf (T2) survived to produce ears. The high mortality of tillers was attributed to high air temperature prevailing during the growth period (33 °C by day; 18 °C by night). Eared tillers did not die and were self supporting because of the photosynthesis by the ear.Grain weight/tiller was positively correlated with tiller dry weight at heading, r= 0·76–0·96. Main shoots contributed about 81% of the total grain yield and 19% came from T1 and T2 tillers.

Download Full-text

Effects of elevated nitrogen application on nitrogen partitioning, plant growth, grain quality and key genes involved in glutamate biosynthesis among three rice genotypes

Chilean journal of agricultural research ◽

10.4067/s0718-58392018000200152 ◽

2018 ◽

Vol 78 (2) ◽

pp. 152-164

Author(s):

Jun Wang ◽

Yi-peng Lu ◽

Jie Wang ◽

Rui-xin Xu ◽

Jun Li ◽

...

Keyword(s):

Plant Growth ◽

Grain Quality ◽

Nitrogen Partitioning ◽

Nitrogen Application ◽

Rice Genotypes ◽

Key Genes ◽

Glutamate Biosynthesis

Download Full-text

A COMPARISON OF PASTURE RECOVERY FOLLOWING DIFFERENT GRAZING INTENSITIES WITH AND WITHOUT NITROGEN APPLICATION

Proceedings of the New Zealand Grassland Association ◽

10.33584/jnzg.1976.38.1454 ◽

1976 ◽

pp. 259-259

Author(s):

D.B. Meads

Keyword(s):

Growth Period ◽

Nitrogen Application ◽

Grazing Intensities

Ryegrass-dominant pasture was differentially grazed in May 1975, and recovery of heavily and laxly defoliated swards compared over a 6-week growth period

Download Full-text

Effects of Nitrogen Application on the Growth and Yield of Quinoa under Saline Conditions in Northern Vietnam

Vietnam Journal of Agricultural Sciences ◽

10.31817/vjas.2021.4.1.01 ◽

2021 ◽

Vol 4 (1) ◽

pp. 903-911

Author(s):

Dinh Thai Hoang ◽

Dang Thi Phuong Anh ◽

Luu Hue Nhan ◽

Nguyen Viet Long

Keyword(s):

Yield Components ◽

Growth Parameters ◽

Growth Period ◽

Application Rate ◽

Growth And Yield ◽

Soil Conditions ◽

Saline Stress ◽

Nitrogen Application ◽

Growth Duration ◽

Two Factors

This study aimed to determine the optimum nitrogen application rate for quinoa in saline soils. Two experiments were conducted: (i) the first experiment was under artificial saline conditions with the two factors of saline regime (stressed and non-stressed) and nitrogen application level (0, 30, 60, 90 and 150 kg N ha-1) in net-houses located in Gia Lam, Hanoi; and (ii) the second experiment was under natural field saline conditions with the two factors of quinoa cultivar (Atlas and Moradas) and nitrogen application level (0, 30, 60, 90, and 150 kg N ha-1) in the coastal areas of Hai Hau, Nam Dinh province. Data were collected for growth duration, insect and disease infestations during the growth period, and various growth parameters and yield components at harvest. The results showed that saline stress reduced the growth and yield parameters, but did not affect the quinoa growth duration of the investigated quinoa cultivars. In both experiments, the growth parameters and yield components increased according to the increase of the nitrogen application rates from 0 to 90 kg N ha-1, then decreased when the nitrogen rates were higher. The results suggested that 90 kg N ha-1 was the optimum nitrogen application dose for quinoa growth and development under saline soil conditions.

Download Full-text

Pengaruh Hormon Asam Indol Asetat yang Dihasilkan Azospirillum sp. terhadap Perkembangan Akar Padi

Jurnal AgroBiogen ◽

10.21082/jbio.v3n2.2007.p66-72 ◽

2016 ◽

Vol 3 (2) ◽

pp. 66 ◽

Cited By ~ 5

Author(s):

Puji Lestari ◽

Dwi N. Susilowati ◽

Eny I. Riyanti

Keyword(s):

Root Growth ◽

Plant Height ◽

Root Development ◽

Close Association ◽

Rice Variety ◽

Growth Period ◽

Nitrogen Application ◽

Rice Culture ◽

Iaa Production

Free-living bacteria of the genus Azospirillum live in close association with rice roots. This bacteria produced indole acetic acid (IAA), a plant growth hormon, to the environment. IAA was isolated from cultures of Azospirillum strains and investigated for its effect on root development and plant height of rice variety IR64 in vitro. Rice cultures of variety IR64 were grown in vitro and inoculated with cultures of Azospirilllum. Production of IAA by the bacterium during its growth period in rice culture medium containing different levels of nitrogen was observed. Results of the experiment showed that strains Azospirillum Az15 and Az44 had a high ability to produce IAA, i.e., 57.93 μg/ml at 12 days after incubation (DAI) and 40.42 μg/ml at 7 DAI, respectively. The IAA production pattern of Azospirillum Az15 and Az44 in the liquid medium were fluctuative until the end of the incubation period, while that of the strain Az7 was linier. Strain Az7 gave a better effect on the root development and plant height than strains Az15 and Az44. Treatment combination of strain Az7 and 100% nitrogen gave highest root development. High level of nitrogen increased IAA content in the uninoculated culture, while low IAA content on the inoculated one. Inoculation the culture with strain Az7 together with 50% nitrogen application resulted in the IAA content, root dry weight, root length, fiber root number, and plant height as high as those on cultures containing 100% nitrogen (1 mM NH4NO3) without inoculation. Inoculation of rice culture with Azospirillum is expected to reduce nitrogen application on rice IR64 by the IAA production as indicated by significant changes in the root growth and development. A higher concentrations of IAA tend to give better effects on the root growth and development of rice IR64.

Download Full-text

Light relationships in grass-clover swards

Australian Journal of Agricultural Research ◽

10.1071/ar9620599 ◽

1962 ◽

Vol 13 (4) ◽

pp. 599 ◽

Cited By ~ 72

Author(s):

WR Stern ◽

CM Donald

Keyword(s):

Growth Period ◽

Botanical Composition ◽

Nitrogen Application ◽

Low Light ◽

Area Index ◽

Light Density ◽

Four Levels ◽

Grass Growth ◽

Reduced Light ◽

Leaf Canopy

Grass-clover swards were grown at four levels of nitrogen to provide a range from extreme clover dominance to extreme grass dominance. Yield, botanical composition, leaf area index, and light density were measured at 3.5 cm vertical intervals in each of the mixed swards throughout the growth period. It was directly demonstrated that the growth of clover in these mixed swards was governed by a series of relationships, namely: (a) Increasing rates of nitrogen application gave increased yields of grass (positive). (b) Increased yields of grass gave higher leaf areas of grass disposed above the clover leaf canopy (positive). (c) Higher leaf areas of grass above the clover reduced the light density at the clover leaf canopy (negative). (d) Reduced light density at the clover leaf canopy caused a reduced growth of the clover (positive). Under conditions of heavy grass growth and of consequent low light density at the clover canopy, the growth of clover not only became slow but eventually was strongly negative, leading to a marked reduction in both the number of clover plants and the yield of clover.

Download Full-text

Phosphorus fertilization in inbred and hybrid rice

Dhaka University Journal of Biological Sciences ◽

10.3329/dujbs.v19i2.8962 ◽

1970 ◽

Vol 19 (2) ◽

pp. 181-187

Author(s):

MR Islam ◽

PK Saha ◽

SK Zaman ◽

MJ Uddin

Keyword(s):

Grain Yield ◽

Key Words ◽

Hybrid Rice ◽

Phosphorus Fertilization ◽

Phosphorus Fertilizer ◽

Yield Difference ◽

P Balance ◽

Rice Genotypes ◽

Boro Rice

Five phosphorus rates (0, 5, 10, 20 and 30 kg P/ha) were tested with four rice genotypes in Boro (BRRI dhan36, BRRI dhan45, EH1 and EH2) and T. Aman (BRRI dhan30, BRRI dhan49, EH1 and EH2) season. Phosphorus rates did not influence grain yield irrespective of varieties in T. Aman season while in Boro season P response was observed among the P rates. Application of P @ 10 kg/ha significantly increased the grain yield. But when P was applied @ 20 and 30 kg P/ha, the grain yield difference was not significant. The optimum and economic rate of P for T. Aman was 20 kg P/ha but in Boro rice the optimum and economic doses of P were 22 and 30 kg/ha, respectively. Hybrid entries (EH1 and EH2) used P more efficiently than inbred varieties. A negative P balance was observed up to 10 kg P/ha. Key words: Response; Phosphorus fertilizer; Inbred; Hybrid rice DOI: http://dx.doi.org/10.3329/dujbs.v19i2.8962 DUJBS 2010; 19(2): 181-187

Download Full-text

Molecular Characterization and Genetic Diversity Study in F3 Population of Rice

Progressive Agriculture ◽

10.3329/pa.v20i1-2.16839 ◽

2013 ◽

Vol 20 (1-2) ◽

pp. 1-8

Author(s):

MM Rahman ◽

L Rahman ◽

SN Begum ◽

F Nur

Keyword(s):

Genetic Distance ◽

Gene Diversity ◽

Random Amplified Polymorphic Dna ◽

Molecular Genetic ◽

Molecular Genetic Analysis ◽

Polymorphic Loci ◽

Rice Genotypes ◽

High Level ◽

Genetic Diversity Study ◽

Diversity Study

Random Amplified Polymorphic DNA (RAPD) assay was initiated for molecular genetic analysis among 13 F3 rice lines and their parents. Four out of 15 decamer random primers were used to amplify genomic DNA and the primers yielded a total of 41 RAPD markers of which 37 were considered as polymorphic with a mean of 9.25 bands per primer. The percentage of polymorphic loci was 90.24. The highest percentage of polymorphic loci (14.63) and gene diversity (0.0714) was observed in 05-6 F3 line and the lowest polymorphic loci (0.00) and gene diversity (0.00) was found in 05-12 and 05-15 F3 lines. So, relatively high level of genetic variation was found in 05-6 F3 line and it was genetically more diverse compared to others. The average co-efficient of gene differentiation (GST) and gene flow (Nm) values across all the loci were 0.8689 and 0.0755, respectively. The UPGMA dendrogram based on the Neis genetic distance differentiated the rice genotypes into two main clusters: PNR-519, 05-19, 05-14, 05-12 and 05-17 grouped in cluster 1. On the other hand, Baradhan, 05-9, 05-13, 05-11, 05-5, 05-6, 05-1, 05-4, 05-15 and 05-25 were grouped in cluster 2. The highest genetic distance (0.586) was found between 05-4 and 05-17 F3 lines and they remain in different cluster.DOI: http://dx.doi.org/10.3329/pa.v20i1-2.16839 Progress. Agric. 20(1 & 2): 1 8, 2009

Download Full-text