scholarly journals Flag Leaf Number Determination of Secondary and Tertiary Tillers and Heading Characteristics of Rice Plants.

1991 ◽  
Vol 60 (3) ◽  
pp. 434-440
Author(s):  
Akio MATSUZAKI ◽  
Tomomi NAKAMOTO ◽  
Hiroyasu MACHIDA
Keyword(s):  
Flag Leaf ◽  
Leaf Number ◽  
Rice Plants

DETERMINATION OF ECONOMIC THRESHOLD LEVEL FOR CHILO AGAMEMNON BLES. INFESTATION IN RICE PLANTS, BASED ON SIMULATED DEAD HEARTS

2016 ◽  
Vol 94 (1) ◽  
pp. 59-69
Author(s):  
ALY M. SOLIMAN ◽  
AHMED S. HENDAWY ◽  
AMANY S. EL-HEFNY ◽  
MAHMOUD R. SHERIF
Keyword(s):  
Threshold Level ◽  
Economic Threshold ◽  
Rice Plants

scholarly journals Relationship between panicle differentiation and main stem leaf number in rice genotypes and red rice biotypes

2009 ◽  
Vol 66 (2) ◽  
pp. 195-203 ◽  
Author(s):  
Nereu Augusto Streck ◽  
Isabel Lago ◽  
Leosane Cristina Bosco ◽  
Gizelli Moiano de Paula ◽  
Felipe Brendler Oliveira ◽  
...  
Keyword(s):  
Oryza Sativa L ◽  
Flag Leaf ◽  
Daily Basis ◽  
Main Stem ◽  
Leaf Number ◽  
Red Rice ◽  
Cultivated Rice ◽  
Sowing Dates ◽  
Number Of Leaves ◽  
Rice Genotypes

Panicle differentiation (DP) is a key developmental stage in rice (Oryza sativa L.) because at this stage plant switches from vegetative to reproductive development and source-sink relation changes to allocate part of the photoassimilates for growing spikelets and kernels. The objective of this study was to determine the main stem Haun Stage (HS) and the number of leaves that still have to emerge until flag leaf at PD in several cultivated rice genotypes and red rice biotypes in different sowing dates. A two-year field experiment was conducted in Santa Maria, Rio Grande do Sul State, Brazil, during the 2005-2006 and 2006-2007 growing seasons, and three sowing dates each year. Nine cultivated rice genotypes and two red rice biotypes were used. PD was identified as the R1 stage of the COUNCE scale, by sampling four plants from each genotype on a daily basis. When 50% of the sampled plants were at R1, the main stem HS was measured in 20 plants per genotype. The main stem final leaf number (FLN) was measured in these 20 plants when the collar of the flag leaf was visible. HS at PD is related to FLN in many cultivated rice genotypes and red rice biotypes, and that at PD, the number of leaves still to emerge until flag leaf is not constant for all the rice genotypes. These findings are not in agreement with reports in the literature.

scholarly journals Determination of Plant Nitrogen Content in Wheat Plants via Spectral Reflectance Measurements: Impact of Leaf Number and Leaf Position

2019 ◽  
Vol 11 (23) ◽  
pp. 2794 ◽  
Author(s):  
Georg Röll ◽  
Jens Hartung ◽  
Simone Graeff-Hönninger
Keyword(s):  
Drought Stress ◽  
Spectral Reflectance ◽  
Nutrient Deficiency ◽  
Leaf Number ◽  
Practical Reasons ◽  
N Content ◽  
Plant Nitrogen ◽  
The Impact ◽  
Reflectance Measurements

The determination of plant nitrogen (N) content (%) in wheat via destructive lab analysis is expensive and inadequate for precision farming applications. Vegetation indices (VI) based on spectral reflectance can be used to predict plant N content indirectly. For these VI, reflectance from space-borne, airborne, or ground-borne sensors is captured. Measurements are often taken at the canopy level for practical reasons. Hence, translocation processes of nutrients that take place within the plant might be ignored or measurements might be less accurate if nutrient deficiency symptoms occur on the older leaves. This study investigated the impact of leaf number and measurement position on the leaf itself on the determination of plant N content (%) via reflectance measurements. Two hydroponic experiments were carried out. In the first experiment, the N fertilizer amount and growth stage for the determination of N content was varied, while the second experiment focused on a secondary induction of N deficiency due to drought stress. For each plant, reflectance measurements were taken from three leaves (L1, L2, L3) and at three positions on the leaf (P1, P2, P3). In addition, the N content (%) of the whole plant was determined by chemical lab analysis. Reflectance spectrometer measurements (400–1650 nm) were used to calculate 16 VI for each combination of leaf and position. N content (%) was predicted using each VI for each leaf and each position. Significant lower mean residual error variance (MREV) was found for leaves L1 and L3 and for measurement position on P3 in the N trial, but the difference of MREV between the leaves was very low and therefore considered as not relevant. The drought stress trial also led to no significant differences in MREV between leaves and positions. Neither the position on the leaf nor the leaf number had an impact on the accuracy of plant nitrogen determination via spectral reflectance measurements, wherefore measurements taken at the canopy level seem to be a valid approach.

scholarly journals Amelioration of Adverse Effect of Drought on Rice (Oryza sativa L.) Variety BRRI Dhan28 through Application of Poultry Litter Based Compost

2020 ◽  
Vol 18 (1) ◽  
pp. 42-55
Author(s):  
AKMMB Chowdhury ◽  
MA Hossain ◽  
J Alam ◽  
MA Hasan ◽  
MZ Islam
Keyword(s):  
Plant Height ◽  
Flag Leaf ◽  
Poultry Litter ◽  
Field Capacity ◽  
Tiller Number ◽  
Proline Content ◽  
Water Levels ◽  
Inorganic Fertilizer ◽  
Leaf Number ◽  
Compost Amendments

An experiment was carried out at the research field of Crop Physiology and Ecology Department, Hajee Mohammad Danesh Science and Technology University, Dinajpur during January 2017 to May 2017 to evaluate the effects of poultry litter based composts on morpho-physiological, yield and yield contributing characters of BRRI dhan28, a mega rice variety of Boro season in Bangladesh, under different water stress conditions. The plants were grown in pots, and the experiment was laid out in a factorial complete randomized design (CRD) with three replications. Factor A included three levels of fertilizer and compost amendments i.e. control (recommended inorganic fertilizer), compost (10 t ha-1) + inorganic fertilizer, compost (20 t ha-1) + without inorganic fertilizers, and factor B comprised of three water levels (continuous flooding, 100% field capacity and 75% field capacity). Different parameters such as plant height, tiller number, leaf number, leaf area, chlorophyll content, proline content and yield contributing characters were measured during the experiment. Most of the measured parameters were significantly influenced by irrigation levels with different fertilizer and compost amendments. The highest plant height and leaf number per hill were found in the treatment of compost (10 t ha-1) + inorganic fertilizer with 100% field capacity, though the maximum tiller number were produced by the interaction of control with flooding irrigation. The total chlorophyll was observed more in flag leaf by the interaction of control with 100% field capacity. The Proline content was observed more in flag leaf by the interaction of control with 75% field capacity. Relative water content was found more with the interaction of compost (10 t ha-1) + inorganic fertilizer with 75% field capacity. The highest effective tiller number hill-1 was found from control (19.33) at harvest. It was also observed that irrigation with 75% field capacity produced the lowest effective tiller (15.89) hill-1 at harvest. The longest panicle length (23.12 cm) was observed with the combined effect of compost (10 t ha-1) +inorganic with 75% field capacity. Thousand grain weight was found highest (18.83 g) in the interaction of compost (20 t ha-1 + without inorganic) with 75% field capacity. The interaction of compost (20 t ha-1 + without inorganic) and flooding irrigation gave the highest grain yield (33.17 g pot-1), which was statistically similar to the treatment of compost (10 t ha-1 + inorganic) with flooding irrigation. The highest harvest index was found from compost (20 t ha-1 + without inorganic) with flooding irrigation. The Agriculturists 2020; 18(1) 42-55

Determination of optimum spatial arrangement of rice plants in direct seeding methods

2002 ◽  
Vol 50 (1) ◽  
pp. 35-42
Author(s):  
V. Anbumozhi ◽  
E. Yamaji ◽  
T. Tabuchi
Keyword(s):  
Spatial Arrangement ◽  
Direct Seeding ◽  
Rice Plants
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