scholarly journals Effect of Date of Transplanting on Growth and Productivity of Rice (Oryza sativa L.) Cultivars

2021 ◽  
Author(s):  
Pardeep Kaur Mann ◽  
Balwinder Singh Dhillon
Keyword(s):  
Grain Yield ◽  
Harvest Index ◽  
Dry Matter ◽  
Underground Water ◽  
Dry Matter Accumulation ◽  
Rice Cultivars ◽  
Panicle Length ◽  
Higher Plant ◽  
Area Index ◽  
1000 Grain Weight

Background: In central Punjab, the primary cause of depleting underground water is early transplantation of long-duration rice varieties. Because of their growth in rainy days and early maturity, the cultivation of medium-duration varieties in the low evaporation period can help to migrate the over draft of underground water. Methods: The field experiment entitled “Effect of date of transplanting on growth and productivity of the rice (Oriza sativa L.) cultivars” was conducted at Research Farm of University College of Agriculture, Guru Kashi University, Talwandi Sabo, Bathinda to study the impact of date of transplanting on growth and productivity of the rice cultivars during kharif season in 2019. The trail was laid out in split plot design with three dates of transplanting (June 15, June 25 and July 5) in main plot and three rice cultivars (PR 122, PR 126 and PUSA 44) in sub plot, replicated thrice. Result: Transplanting on 15 June crop recorded significantly higher plant height at 30, 60 DAT and at harvest viz. 67.4, 110.0 and 122.6 cm respectively; number of tillers at 30, 60 DAT and at harvest viz. 59.4, 58.2 and 46.2 respectively; leaf area index (LAI) at 60 DAT (3.1); dry matter accumulation (DMA) at 30, 60 DAT and at harvest viz. 8.5, 26.7 and 132.6 q/ha respectively; number of days taken to panicle initiation (57.6); number of days taken for 50 per cent flowering (64.1); effective tillers per meter row length (38.6); panicle length (26.1 cm); panicle weight (6.1 g); number of grains per panicle (177.9); 1000-grain weight (31.0g); grain yield (72.2 q/ha); straw yield (161.1 q/ha); harvest index (33.4%). The grain yield was at par with June 25. Among the cultivars, PUSA 44 recorded significantly higher plant height at 30, 60 DAT and at harvest viz. 70.6, 117.4 and 128.6 cm respectively; number of tillers at 30, 60 DAT and at harvest viz. 65.0, 60.3 and 50.4 respectively; leaf area index (LAI) at 60 DAT (3.4); dry matter accumulation (DMA) at 30, 60 DAT and at harvest viz. 9.5, 31.3 and 153.4 q/ha respectively; number of days taken to panicle initiation (65.2); number of days taken for 50 per cent flowering (68.7); effective tillers per meter row length (43.2); panicle length (27.5 cm); panicle weight (6.5 g); number of grains per panicle (195.7); 1000-grain weight (34.7g); grain yield (80.1 q/ha); straw yield (181.2 q/ha); harvest index (34.1%). June 15 transplanting produced significantly higher grain yield which was 1.5 and 6.4% higher than June 25 and July 5 transplanting respectively. PUSA 44 produced significantly higher grain yield which was 27.3 and 17.4% higher than PR 126 and PR 122 respectively. All the interaction effect of date of transplanting and rice cultivars recorded non-significant results.

scholarly journals Effect of variety and nitrogen rate on the yield performance of boro rice

2015 ◽  
Vol 26 (1) ◽  
pp. 6-14 ◽  
Author(s):  
SG Chamely ◽  
N Islam ◽  
S Hoshain ◽  
MG Rabbani ◽  
MA Kader ◽  
...  
Keyword(s):  
Grain Yield ◽  
Harvest Index ◽  
Dry Matter ◽  
Block Design ◽  
Panicle Length ◽  
Straw Yield ◽  
Randomized Complete Block Design ◽  
Harvest Data ◽  
1000 Grain Weight ◽  
Boro Rice

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from November 2010 to May 2011 to study the effect of variety and rate of nitrogen on the performance of Boro rice. The experiment comprised three varieties viz., BRRI dhan28 (V1), BRRI dhan29 (V2) and BRRI dhan45 (V3); and five rates of nitrogen viz., control (N0), 50 kg  (N1), 100 kg (N2), 150 kg  (N3)and 200 kg  (N4) N ha-1. The experiment was laid out in a randomized complete block design with four replications. The growth analysis results indicate that the tallest plant (80.88 cm) and the highest number of total tillers hill-1 (13.80) were observed in BRRI dhan29 at 70 DATs and the highest total dry matter (66.41 g m-2) was observed in BRRI dhan45. The shortest plant (78.15 cm) and the lowest number of tillers hill-1 (12.41) were recorded from BRRI dhan45 and the lowest dry matter (61.24 g) was observed in BRRI dhan29. The tallest plants (84.01 cm), highest number of tillers hill-1 (14.06) and the highest dry matter (69.58 g m-2) were obtained from 200 kg N ha-1. The tallest plants (86.48 cm) and maximum dry matter (72.30 g m-2) were recorded from BRRI dhan28 with 200 kg N ha-1 and BRRI dhan45 with 200 kg N ha-1, respectively. The highest number of tillers hill-1 (15.14) was obtained from BRRI dhan29 with 50 kg N ha-1. The harvest data reveal that variety had significant effect on total tillers hill-1, effective tillers hill-1, non-effective tillers hill-1, panicle length, grain yield, straw yield and harvest index. The highest grain yield (4.84 t ha-1) was recorded from BRRI dhan29. The results of the experiment also indicate that total tillers hill-1, effective tillers hill-1, grains panicle-1, sterile spikelets panicle-1, grain yield, straw yield and harvest index were significantly affected by levels of nitrogen, while plant height, panicle length, 1000-grain weight were not significantly affected by levels of nitrogen. The highest grain yield (5.58 t ha-1) was obtained from 200 kg N ha-1. Interaction effect of variety × 200 kg N ha-1 produced the highest grain yield (5.82 t ha-1). From the results of the study it may be concluded that BRRI dhan29 rice may be cultivated with 200 kg N ha-1 for obtaining higher yield in AEZ 9 of Bangladesh.Progressive Agriculture 26:6-14, 2015

scholarly journals Adoption of Efficient Varieties, And Nitrogen Management For Improving Agronomic Attributes, And Yield of Winter Wheat

2021 ◽  
Author(s):  
Hafeez Noor ◽  
Sun Min ◽  
Wen Lin ◽  
Zhiqiang Gao
Keyword(s):  
Grain Yield ◽  
Protein Content ◽  
Harvest Index ◽  
Dry Matter ◽  
Wheat Variety ◽  
Water Storage ◽  
Grain Protein Content ◽  
Soil Water Storage ◽  
Dry Matter Accumulation ◽  
1000 Grain Weight

Abstract This study greenhouse experiment aimed to evaluate the biochemical impact of nitrogen (N) fertilization on different wheat cultivars. The experiment included two varieties (YH-618 and YH-20410) and three nitrogen levels, (N0, N210, and N280 Kg ha–1. Our results indicated that wheat variety YH-20410 had the higher nitrogen uptake and efficiency, grain protein content, and yield at higher planting densities and will benefit farmers by forming stronger overall crops. For variety YH-20410, the soil water storage at the wintering stage was significantly highest at N280 kg ha–1, In conclusion, variety YH-20410, wheat higher dry matter accumulation of each organ at maturity stage, and the dry matter accumulation of leaf, stem + leaf sheath. Compared to N0 and N180 Kg ha–1, N210 kg ha–1 significantly increased the N harvest index by 5.0% to 19.4% and N use efficiency by 2.9% to 9.1%, but there was no significant difference in N uptake efficiency. In conclusion, variety YH-20410 was beneficial to improve the harvest index and N productivity of wheat. Variety YH-20410, has also the greater number of spike number, grains per spike and 1000-grain weight, leading to high grain yield. Among nitrogen treatments, N280 Kg ha–1 significantly increased the grain number per spike, 1000-grain weight and yield. Significantly increased grain gluten content, grain protein content and protein yield under of YH-20410 variety. In conclusion, reduced N fertilizer 280 kg ha–1 and variety YH-20410 was beneficial to the improved the leaf area index, plant height, soil water storage, dry matter accumulation, and grain yield.

scholarly journals Effect of sowing time on growth and yield attributes of three mustard cultivars grown in Tidal Floodplain of Bangladesh

2017 ◽  
Vol 14 (2) ◽  
pp. 155-160
Author(s):  
MAR Sharif ◽  
MZ Haque ◽  
MHK Howlader ◽  
MJ Hossain
Keyword(s):  
Grain Yield ◽  
Leaf Area Index ◽  
Dry Matter ◽  
Growth And Yield ◽  
Index Number ◽  
Sowing Time ◽  
Area Index ◽  
Yield Attributes ◽  
Sowing Dates ◽  
1000 Grain Weight

The experiment was conducted at the field laboratory of the Patuakhali Science and Technology University, Patuakhali, Bangladesh during the period from November, 2011 to March 2012 under the tidal Floodplain region to find out optimum sowing time for the selected three cultivars (BARI Sharisha-15, BINA Sharisha-5 and BARI Sharisha-9). There were four sowing dates viz. 30 November, 15 December, 30 December and 15 January. Significant variations due to different sowing dates were observed in plant height, total dry matter, leaf area index, number of siliqua plant-1, seeds silique-1, 1000-grain weight, grain yield and HI. Results showed that the highest grain yield (1.73 t ha-1) was obtained from the first sowing (30 November) with BINA Sharisha-5 and it was significantly different from the yields of all other combination.J. Bangladesh Agril. Univ. 14(2): 155-160, December 2016

scholarly journals Genetic Variability, Correlation and Path Analysis Studies in Rabi Sorghum (Sorghum bicolour (L.) Moench) Genotypes

2021 ◽  
Vol 10 (10) ◽  
pp. 185-192
Author(s):  
M. S. Nikam G. C. Shinde ◽  
V. R. Awari M. S. Shinde ◽  
N. S. Kute
Keyword(s):  
Grain Yield ◽  
Path Analysis ◽  
Harvest Index ◽  
Panicle Length ◽  
Green Leaves ◽  
Days To Maturity ◽  
Fodder Yield ◽  
Correlation And Path Analysis ◽  
1000 Grain Weight ◽  
Panicle Weight

The forty four promising sorghum genotypes were evaluated for variability, correlation and path analysis for yield and yield contributing characters, at Sorghum improvement Project, Mahatma Phule Krishi Vidyapeeth, Rahuri during Rabi-2019-20. High estimates of PCV and GCV were observed for traits no. of green leaves per plant at harvest, panicle length (cm), panicle width (cm), panicle weight (g), harvest index and grain yield per plant (g).High estimates of heritability along with high genetic advance were recorded for plant height (cm), no. of green leaves per plant at harvest, panicle length (cm), panicle width (cm), panicle weight (g), 1000 grain weight (g), dry fodder yield per plant (g), harvest index and grain yield per plant (g).Correlation studies revealed a positive and significant association of grain yield with plant height (cm), number of internodes per plant, number of green leaves per plant at harvest, panicle length (cm), panicle width (cm), panicle weight (g), 1000 grain weight (g), dry fodder yield per plant (g) and harvest index at both genotypic and phenotypic level. Harvest index, panicle weight, dry fodder yield per plant, days to maturity and no. of internodes per plant recorded high magnitudes of direct effects accompanied by highly significant correlation with the grain yield at genotypic level, indicating true and perfect relationship between them. Thus suggesting that selection for these traits viz., harvest index, panicle weight, dry fodder yield per plant, days to maturity and no. of internodes per plant will be highly rewarding for improving the grain yield per plant.

scholarly journals Effect of variety and planting density on weed dynamics and yield performance of transplant Aman rice

2017 ◽  
Vol 15 (2) ◽  
pp. 167-173
Author(s):  
MU Salma ◽  
MA Salam ◽  
K Hossen ◽  
MRJ Mou
Keyword(s):  
Grain Yield ◽  
Harvest Index ◽  
Dry Weight ◽  
Planting Density ◽  
Panicle Length ◽  
Yield Performance ◽  
Straw Yield ◽  
Weed Density ◽  
Weed Dynamics ◽  
1000 Grain Weight

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during Aman season from June to November 2016 to find out the effect of variety and planting density on weed dynamics and yield performance of transplant Aman rice. The experiment consisted of four varieties viz. Binadhan-7, BR25, BRRI dhan56 and BRRI dhan62 and four planting density viz. 25 cm × 15 cm, 25 cm × 10 cm, 20 cm × 15 cm and 20 cm × 10 cm. The experiment was laid out in a randomized complete block design with three replications. Variety exerted significant effect on weed density and dry weight at different days after transplanting (DAT). The lowest weed density and dry weight were observed in BR25 and the highest ones were observed in Binadhan-7. Weed population was not significantly affected by planting density while weed dry weight was significantly affected and closer spacing produce the lowest weed dry weight. Yield and yield contributing characters of transplant Aman rice were significantly influenced by variety and planting density. BR25 showed produce the highest plant height (157.9 cm), panicle length (24.94 cm), grains panicle(103.10), sterile spikelets panicle−1 (29.36), grain yield (4.30 t ha−1) and straw yield (8.99 t ha−1) while BRRI dhan62 the highest number of total tillers hill−1 (14.75), effective tillers hill−1 (11.62), and non-effective tillers hill−1 (3.10). The highest 1000-grain weight (25.21g) was found in the variety Binadhan-7and the highest harvest index (53.50%) was obtained from BRRI dhan56. In case of planting density, the highest value of plant height (124.27 cm), total tillers hill−1 (13.53), effective tillers hill−1 (11.20), non-effective tillers hill−1 (2.32), panicle length (22.59 cm), grain yield (4.17 t ha−1) and straw yield (5.75 t ha−1) were obtained from 25 cm × 15 cm spacing. On the other hand, the highest number of grains panicle−1 (84.23) and harvest index (45.18 %) were obtained from 25 cm × 10 cm spacing, heaviest 1000-grain weight (23.83 g) from 20 cm × 15 cm spacing. Experimental results indicated that BR25 grown under 25 cm × 15 cm planting density appeared to be the best in order to get maximum grain yield as well as reducing weed infestation.J. Bangladesh Agril. Univ. 15(2): 167-173, December 2017

scholarly journals Effect of the duration of the vegetative phase on crop growth, development and yield in two contrasting pearl millet hybrids

1988 ◽  
Vol 110 (1) ◽  
pp. 71-79 ◽  
Author(s):  
P. Q. Craufurd ◽  
F. R. Bidinger
Keyword(s):  
Grain Yield ◽  
Leaf Area ◽  
Pearl Millet ◽  
Harvest Index ◽  
Dry Matter ◽  
Grain Filling ◽  
Stem Growth ◽  
Dry Matter Accumulation ◽  
Dry Matter Partitioning ◽  
Vegetative Phase

SummaryThe phenotype of medium duration pearl millet varieties grown in West Africa differs from that of the shorter duration millets grown in India. African varieties are usually much taller, have longer panicles, fewer productive tillers, and a lower ratio of grain to above-ground dry-matter (harvest index). The effect of crop duration on plant phenotype was investigated in two hybrids using extended daylengths to increase the duration of the vegetative phase (GSl: sowing to panicle initiation). The two hybrids, 841A × J104 and 81A × Souna B, were considered to represent the Indian and African phenotype, respectively. Tiller production and survival, leaf area, and dry-matter accumulation and partition, were monitored over the season. Grain yield and its components were determined at maturity.The two hybrids responded similarly to the short and long daylength treatments. The duration of GSl was increased from 20 to 30 days, resulting in increased number of leaves, leaf area, and stem and total dry-matter accumulation; there was no effect on tiller production and survival, or on panicle growth rate. Grain yield was, therefore, the same in both GSl treatments, and harvest index (HI) was much reduced in the long GSl treatment owing to the increased stem growth. One evident effect of a longer GSl was on dry-matter partitioning between shoots; partitioning to the main stem (MS) was increased, whereas partitioning to the tillers was reduced.There was no difference in crop development, growth or yield between the two hybrids in either GSl treatment. The only significant differences were in the efficiency with which intercepted radiation was converted to dry matter, which was greater in 841A × J104 than in 81A × Souna B, and in the balance between MS and tillers; the grain yield of the MS was significantly greater in 81A x Souna B than in 841A × J104, but at the expense of number of productive tillers.The results demonstrate that both African and Indian phenotypes are equally productive under good agronomic conditions. The lower HI in longer duration African millets is a consequence of a much extended stem growth phase and therefore increased competition between stem and panicle during grain filling. Possible ways to increase grain yield in the medium duration African millets are considered.

scholarly journals Influence of priming and nitrogen on growth behavior of buckwheat (Fagopyrum esculentum) in rainfed condition of midhill in Nepal

2018 ◽  
pp. 47-54
Author(s):  
J. J. Gairhe ◽  
T. N. Bhusal ◽  
H. Neupane
Keyword(s):  
Moisture Content ◽  
Grain Yield ◽  
Harvest Index ◽  
Dry Matter ◽  
Seed Priming ◽  
Germination Percentage ◽  
Dry Matter Accumulation ◽  
Straw Yield ◽  
Nitrogen Levels ◽  
Gm Plant

 An experiment was conducted during winter, 2010/11 at IAAS, Lamjung with the objective of studying effect of seed priming and nitrogen levels on yield and yield attributing characters of buckwheat. Altogether, there were 9 treatments of seed priming hours (0, 18 and 36) combined with nitrogen levels (30, 45 and 60 kg/ha). The experiment was laid out in randomized complete block design and each treatment was replicated thrice. The seed priming of 36 hours had resulted in significantly higher germination percentage in both 15 days after sowing (DAS) (4.40%) and 30 (DAS) (5.74%) The total germination percentage was also significantly higher (48.4%) with 36 hr seed priming. The main and interaction effects of seed priming and nitrogen levels had significant influence on days to 50% flowering. The dry biomass per plant, grain yield, straw yield, harvest index and percentage moisture content of biomass at harvest were found non-significantly different due to seed priming and nitrogen levels. The highest value for dry matter accumulation per plant (5.24 gm/plant), straw yield (8706 kg/ha) and % moisture content (71.0%) was recorded with 36 hr seed priming whereas the highest value for grain yield (1599 kg/ha), and harvest index (19.8) was obtained with 18 hr seed priming. Likewise, dry matter accumulation (5.38 gm/plant), grain yield (1575 kg/ha) and harvest index (22.0) was found highest in 45 kg N/ha. Similarly, the straw yield (9153 kg/ha) and % moisture content (75.3%) was found highest in the treatment with 60 kg N/ha. The interaction effect between nitrogen level and priming was found non-significant and the highest grain yield (2091 kg/ha) was obtained from 18 hr seed priming with 45 kg N/ha. Phosphorus consumption rate was intrestingly higher in buckwheat plot with nitrogen application. Moderate consumption of potassium was also observed while nitrogen content in soil remain apparantly unchanged and similar was the case with soil pH and organic matter content. Application of phosphatic fertilizer would be benefitial for buckwheat cultivation. Further experiment should be done to verify the effective dose of fertilizer.Journal of the Institute of Agriculture and Animal Science. Vol. 33-34, 2015, Page: 47-54

scholarly journals Performance of Transplant Aus Rice Varieties under Different Nitrogen Management Practices

2021 ◽  
pp. 52-62
Author(s):  
Md. Omar Faruk ◽  
A. S. M. Iqbal Hussain ◽  
Md. Abu Yusuf ◽  
Md. Nazmul Hasan Mehedi
Keyword(s):  
Grain Yield ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Plant Height ◽  
Nitrogen Management ◽  
Grain Weight ◽  
Panicle Length ◽  
Rice Varieties ◽  
Area Index ◽  
1000 Grain Weight

Management of applied nitrogen in rice field is one tool that could lead to increase in rice yield, but often ignored by most farmers. The experiment was carried out from April to July 2015 at the Agronomy Field Laboratory of Patuakhali Science and Technology University, Dumki, Patuakhali to find out the influence of different nitrogen management and variety on the yield performance of transplant Ausrice. The study consisted of four levels of nitrogen viz. Control (without N), 30 kg N ha-1, 60 kg N ha-1 and urea super granule @ 52 kg N ha-1 and four Transplanted aus rice varieties viz. KaliHitta, ChaitaBoro, Abdul Hai and Gota IRRI, and was laid out in a split-plot design with three replications. The levels of nitrogen were assigned in the main plot and varieties were allocated in the sub-plots. Nitrogen management, variety and their interactions exerted significant (P ≤ 0.05) influence on plant characters, yield contributing characters and yield of transplanted Aus rice. In the case of nitrogen management, the tallest plant was 161.60 cm, maximum leaf area index(2.97, the highest number of effective tillers hill-115, longest panicle 24.30 cm with the maximum number of filled grains as94.73, 1000-grain weight gave 29.97 g. Grain yield of 2.48 t ha-1 were obtained from USG @ 52 kg N ha-1 and the shortest plant height of 136.90 cm with lowest leaf area index of 1.78, lowest number of effective tillers hill-1 (8.43), shortest panicle (18.84 cm) with the lowest numbers of filled grains panicle-1 (53.18), 1000-grain weight (24.33 g) and grain yield (1.40 t ha-1) were obtained in control (N1=O, kg N ha-1). Among the varieties, ChaitaBoro gave the tallest plant height (151.60 cm) and maximum leaf area index (2.54). While the highest number of effective tillers hill-1 (12.20), longest panicle (22.42 cm) with the maximum number of filled grains panicle-1 (73.50), highest 1000-grain weight (27.41 g) and highest grain yield (2.39 t ha-1) were recorded from Gota IRRI than other varieties. In case of interaction, Gota IRRI Fertilized with USG at 52 kg N ha-1 produced the highest number of effective tillers hill-1 (16.87), panicle length (25.13 cm), number of grains panicle-1 (105.70) and grain yield (3.13 t ha-1). The lowest number of effective tillers hill-1 (8.13), lowest panicle length (17.47 cm) with minimum numbers of filled grains 47.67) and grain yield (1.12 t ha-1) were produced by the interaction of control (N1=O, kg N ha-1) and Kali Hitta. So, cultivation of transplant Aus rice (Gota IRRI) appeared to be the best performance with USG @ 52 kg N ha-1 and recommended to the end users.

Effect of Cd on the growth, dry matter accumulation and grain yield of different rice cultivars

2007 ◽  
Vol 87 (6) ◽  
pp. 1088-1095 ◽  
Author(s):  
Jianguo Liu ◽  
Guoliang Cai ◽  
Min Qian ◽  
Deke Wang ◽  
Jiakuan Xu ◽  
...  
Keyword(s):  
Grain Yield ◽  
Dry Matter ◽  
Dry Matter Accumulation ◽  
Rice Cultivars

Density and row spacing effects on irrigated short wheats at low latitude

1976 ◽  
Vol 87 (1) ◽  
pp. 137-147 ◽  
Author(s):  
R. A. Fischer ◽  
I. Aguilar M. ◽  
R. Maurer O. ◽  
S. Rivas A.
Keyword(s):  
Grain Yield ◽  
Dry Matter ◽  
Light Interception ◽  
Dry Matter Production ◽  
Seeding Density ◽  
High Fertility ◽  
Dry Matter Accumulation ◽  
Area Index ◽  
Matter Production ◽  
Very High

SummaryDuring four winter seasons eight spacing and density experiments were made under irrigated high fertility conditions in north-west Mexico (latitude 27° N). Experiments included various Triticum aestivum and T. durum genotypes of spring habit, short stature derived from Norin 10 genes, and contrasting plant type. Measurements included dry-matter production, photosynthetic area index, and light interception during one experiment, total dry matter at maturity in most others and grain yield and its numerical components in all experiments.Grain yield and most other crop characters were unaffected by row spacings within the range 10–45 cm interrow width. The optimal seeding density for maximum grain yield was 40–100 kg/ha (80–200 plants/m2). Yield reductions at lower densities (20, 25 kg/ha) were slight and accompanied by reduced total dry-matter production. Yield reductions at higher densities (160–300 kg/ha) were also slight and were associated with more spikes/m2 but fewer grains/m2 and reduced harvest index. It is suggested that lower than normal preanthesis solar radiation or weather conditions leading to lodging can magnify these yield depressions at higher densities.Measurements showed rapid approach of crops to 95% light interception, reached even at a density of 50 kg/ha within 50 days of seeding. It is suggested that provided this occurs before the beginning of substantial dry-matter accumulation in the growing spikes (60 days after seeding) there will be no loss of grain yield with reduced seeding density. Results point to a ceiling photosynthetic area index for maximum crop growth rate although there was a tendency for rates to fall at very high indices (> 9). This tendency was associated with very high density, high maximum numbers of shoots, poor survival of shoots to give spikes (< 30%) and reduced number of grains/m3;. The relatively low optimal densities seen here may be characteristic of genotypes derived from Norin 10.Genotype × spacing, genotype × density and spacing × density interactions were generally non-significant and always small. There was a tendency for the presence of non-erect leaves or branched spikes to reduce the optimal density, but large differences in tillering capacity had no influence. Differences in lodging susceptibility can however lead to substantial genotype x density interactions.

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