Influence of sowing dates on the growing degree days and phenology of winter maize (Zea mays L.)

1986 ◽  
Vol 38 (1-3) ◽  
pp. 47-57 ◽  
Author(s):  
S.S. Narwal ◽  
S. Poonia ◽  
G. Singh ◽  
D.S. Malik
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Growing Degree Days ◽  
Degree Days ◽  
Sowing Dates

scholarly journals Prediction of phenological stages of six maize (Zea mays L.) hybrids based on required growing degree days

2020 ◽  
Vol 8 (3) ◽  
pp. 2564-2574
Author(s):  
Ravi Babu M ◽  
Rao KLN ◽  
Ashokarani Y ◽  
Martiluther M ◽  
Prasad PRK
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Growing Degree Days ◽  
Degree Days ◽  
Phenological Stages

Changing of Vegetative to Reproductive Ratio as a Response to Different Sowing Dates in Sunflower

Helia ◽  
2018 ◽  
Vol 41 (69) ◽  
pp. 253-266
Author(s):  
Ali Asghar Aliloo
Keyword(s):  
Edible Oils ◽  
Sowing Date ◽  
Biodiesel Production ◽  
Growing Degree Days ◽  
Comprehensive Model ◽  
Yield Losses ◽  
Degree Days ◽  
North West ◽  
Long Period ◽  
Sowing Dates

AbstractSunflower is an important source for edible oils and biodiesel production. Its productivity is limited by many agronomical practices one of which is the sowing date. In this study, the effects of different sowing dates from early April to late June on phenology and yield of sunflower cultivars were investigated. The results showed that sunflower has a relatively long period of possible sowing dates, stretching from early April to late June in North West of Iran. However, delayed sowing dates significantly decreased the number of days needed for phenophases. For every day of delay, the model predicted (R2=0.97) a losing rate in achene yield by 22.2 kg h−1 from the first sowing date. For relationships between growing degree days (GDD) and yield, almost the same results were obtained. About 22 kg h−1 reduction (R2=0.79) in yield per day was estimated by GDD index when the average GDDs per day was 14.2. However, helio-thermal units (HTU) did not predict this reduction accurately. A suggested comprehensive model, that used the percent of yield losses and changes in vegetative to reproductive ratio, found a significant and positive relationship between the indices and yield losses. For all indices, an increase in vegetative to reproductive ratio resulted in increased grain yield losses.

PREDICTION OF SOIL TEMPERATURE FROM AIR TEMPERATURE FOR ESTIMATING CORN EMERGENCE

1990 ◽  
Vol 70 (3) ◽  
pp. 619-628 ◽  
Author(s):  
L. M. DWYER ◽  
H. N. HAYHOE ◽  
J. L. B. CULLEY
Keyword(s):  
Nonlinear Response ◽  
Zea Mays L ◽  
Thermal Environment ◽  
Growing Degree Days ◽  
Degree Days ◽  
Emergence Period ◽  
Air Temperatures ◽  
Soil Temperatures ◽  
Production Areas ◽  
Zone Temperature

The soil thermal environment is critical to corn (Zea mays L.) emergence in short-season production areas. A field study was therefore carried out during the emergence period to test a method to predict 0.05-m soil temperatures from air temperatures and to develop a method to quantify emergence rates as a function of actual and predicted soil thermal units. Thermal units (base 10 °C) were calculated from hourly air and measured and predicted 0.05-m soil temperatures; these thermal units were fit to test emergence data collected on six cultivars. The nonlinear response of percentage emergence to thermal units was approximated by an exponential function. Comparisons of cultivar emergence rates, expressed as the number of thermal units to 0 and 75% emergence, statistically differentiated (P ≤ 0.05) the test cultivars into three main groupings. When predicted soil temperatures were used to calculate the number of thermal units, the thermal units to specific emergence levels were within the equivalent of 1 or 2 d of those generated using measured soil temperatures.Key words: Growing degree days, regression, thermal regimes, seed zone temperature, corn emergence

Longspine Sandbur (Cenchrus longispinus) Ecology and Interference in Irrigated Corn (Zea mays)

1997 ◽  
Vol 11 (4) ◽  
pp. 667-671 ◽  
Author(s):  
Randy L. Anderson
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Great Plains ◽  
Plant Development ◽  
Production Systems ◽  
Growing Degree Days ◽  
Degree Days ◽  
Boot Stage ◽  
Plant Seedlings ◽  
Corn Grain

Longspine sandbur is a troublesome weed infesting corn in the Great Plains. However, herbicides are now available to control this species. This study characterized longspine sandbur ecology in irrigated corn to aid producers in integrating herbicides into their production systems. Longspine sandbur began emerging May 25, and by June 15, 84% of the seasonal emergence had occurred. Plant development was related to cumulative growing degree days. Seeds were viable early in longspine sandbur's development, with 20% of seeds viable by heading. Producers can minimize seed production of longspine sandbur in field borders by mowing plants at the boot stage. Bur production per plant was related to time of emergence, with seedlings emerging in late May producing 1,120 burs per plant. Seedlings emerging 4 wk later produced 84% fewer burs. Controlling longspine sandbur before 4 wk of interference prevented loss of corn grain yield.

scholarly journals THE EFFECT OF DIFFERENT SOWING TIMES ON FRESH EAR YIELD AND YIELD COMPONENTS IN SWEET CORN (ZEA MAYS L. SACCHARATA STURT.) VARIETIES

2021 ◽  
Vol 186 (2) ◽  
pp. 183-199
Author(s):  
Sevda KILINÇ ◽  
Şehmus ATAKUL ◽  
Şerif KAHRAMAN ◽  
Hüsnü AKTAŞ ◽  
İrfan ERDEMCİ ◽  
...  
Keyword(s):  
Zea Mays ◽  
Plant Height ◽  
Yield Components ◽  
Zea Mays L ◽  
Sweet Corn ◽  
Sowing Time ◽  
Sowing Dates ◽  
Yield And Yield Components ◽  
Ear Height ◽  
Ear Number

This study was carried out to investigate the effects of different sowing times on duration of tasselling, plant height, first ear height, ear length, ear diameter, number of ears per plant, fresh ear yield with husk, fresh ear yield unhusked, and marketable number of ears of different sweet corn (Zea mays L. saccharata Sturt.) varieties in Diyarbakır between the years of 2010-2012. The trial was conducted as split plots in randomised complete blocks with three replications. The main plots were sowing times, and the sub-plots were varieties. The trials were carried out at eight different sowing times (1 April, 15 April, 1 May, 15 May, 1 June, 15 June, 1 July and 15 July) with ‘Merit’, ‘Jubilee’, ‘Lumina’, ‘Vega’ and ‘Sakarya’ composite sweet corn varieties. From the variance analysis of the three-year combined average, the duration of tasselling, plant height, first ear height, ear length, ear diameter, number of ears per plant, fresh husked ear yield, fresh unhusked ear yield and marketable ear number were statistically significant for sowing times and varieties. According to the sowing time × variety interaction, except ears per plant and first ear height values, all other traits were significant. The fresh husked and unhusked ear yields varied between 8541.7-19396.8 kg ha-1 and 5065.0-13485.7 kg ha-1, respectively. The highest fresh husked and fresh unhusked ear yields were obtained from the 15 April sowing time of ‘Vega’ variety. The results state that optimal sowing dates for different varieties of sweet corn could be from 1 April to 1 May, and the most suitable variety to be planted is ‘Vega’ in Diyarbakır conditions.

scholarly journals Investigation of the Effect of P-Supply on Maize (Zea mays L.) Development

2003 ◽  
pp. 171-173
Author(s):  
Klára Pokovai ◽  
János Géza Kovács ◽  
János Nagy
Keyword(s):  
Zea Mays ◽  
Plant Development ◽  
Zea Mays L ◽  
Ecological Factors ◽  
Plant Nutrients ◽  
Leaf Number ◽  
Degree Days ◽  
Flowering Stage ◽  
P Supply

Quantification of plant development is important in areas where the actual dates of certain phonological stages should be identified. The influences of different ecological factors are put into algorithms by crop modellers. In this process the effect of plant nutrients are not yet well quantified. This paper gives data on the effect of phosphorus on maize development prior to flowering stage. The main conclusions are as follows: 1. In lack of phosphorus more degree days are needed for flowering then in case of well P-supply. 2. The effect of P is seen not on leaf initialisation (i.e. final eaf number is the same) but rather on the phyllochron interval. 3. P effect on phyllochron interval can be observed at the younger stage (prior to leaf number 10) but not later.

scholarly journals The results of the assessment of self-pollinated precocious lines of maize (Zea mays L.) on the main economically valuable traits at two sowing dates

2021 ◽  
Vol 17 (2) ◽  
pp. 113-122
Author(s):  
Maksym Olkhovyk ◽  
Oleksandr Haidash ◽  
Yulyia Kupar ◽  
Mayna Tahantsova
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Sowing Date ◽  
Study Selection ◽  
Sowing Dates ◽  
Grain Moisture ◽  
Morphobiological Characteristics ◽  
Economically Valuable Traits ◽  
Selection Of ◽  
Late Sowing

Purpose. Comprehensive study, selection, evaluation and systematization of self-pollinated lines of maize (Zea mays L.) obtained on the basis of material of diffe­rent genetic structure from endosperm of flint and dent maize were implemented according to the main economically valuable traits and precocity in order to select the best genotypes for selection. Methods. Hybridization, inbreeding were used in the process of creating the initial material; visual method – for phenological observations; laboratory and field – to determine the morphobiological characteristics of self-pollinated lines of maize; measuring and weighing – to account the harvest and determine the metric characteristics of plants; mathematical and statistical – to determine the validity of the results, indicators of trait variability, correlation dependence of traits; analysis of variance; comprehensive assessment of morphobiological and economically valuable traits of self-pollinated maize lines of the most common germplasms. Results. As a result of assessment of self-pollinated lines of the most common germplasms, it was revealed that the highest level of grain yield was obtained under both sowing periods – Iodent germplasm; the minimum grain moisture content – Flint and Mix germplasms; the shortest average duration of the emergence – flowering of 50% of male and female inflorescences stage – Flint germplasm; steadily high va­lues ​​of plant height for germplasm Mix – under the optimal sowing date, and Iodent plasma – under the late sowing date. Steadily high values ​​of the ear insertion height at both sowing dates were obtained for lines based on Iodent germplasm. The number of the most precocious and the best by the economically valuable traits germplasms of self-pollinated lines were identified. Conclusions. The DK239 lines – Flint germplasm, DK7174, DK2285, DK305, DK2613, DK5568 – Iodent germplasm, DK2332 and DK2659 – Mix germplasm were the most precocious and the best by the economically valuable traits. They are promising for the selection of ultra-early hybrids of maize adapted to the conditions of the Steppe of Ukraine.

scholarly journals Productivity of maize (Zea mays L.) as affected by varieties and sowing dates

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Dil Bahadur Gurung ◽  
Balram Bhandari ◽  
Jiban Shrestha ◽  
Mahendra Prasad Tripathi
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Research Program ◽  
Zea Mays L ◽  
Sowing Date ◽  
Research Field ◽  
Yield Potential ◽  
Grain Production ◽  
Sowing Dates ◽  
Maize Varieties

Genotypic yield potential of maize varieties is greatly affected by sowing dates. In order to investigate the effects of sowing dates and varieties on the grain yield of maize, the field experiment was carried out at research field of National Maize Research Program (NMRP), Rampur, Chitwan, Nepal from April 2009 to March 2010.  Three varieties namely Rampur Composite, Arun-2 and Gaurav were sown at every week. The results of experiment showed that interaction effect of variety and sowing date on grain yield of maize was significant. Rampur Composite produced highest grain yield (6.1 t/ha) in August and lowest yield (2.6 t/ha) in May. Similarly Arun-2 produced highest yield (4.6 t/ha) in August and lowest yield (2.1 t/ha) in May. Gaurav produced highest grain yield (5.1 t/ha) in September followed by 4.9, 4.8 and 4.6 t/ha in February, July and August respectively and lowest yield (1.5 t/ha) in November. The sowing date was highly significant on grain production. The highest grain production was 5.1 t/ha in August followed by in February (4.9 t/ha), September (4.6 t/ha) and March (4.4 t/ha) respectively. The lowest grain yield was produced in May (2.4 t/ha). Therefore it was concluded that August planting was best for higher grain production of maize varieties (Rampur Composite, Arun-2 and Gaurav) in terai region of Nepal.

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