Effect Of Planting Date Research Articles

Effects of planting date and spraying with organic fertilizers on vegetative growth indices of dill plant (Anethum graveolens L.)

Effects of planting date and spraying with organic fertilizers on vegetative growth indices of dill plant (Anethum graveolens L.)

Effects of planting date and plant density on yield and some physiological characteristics of single cross 550 hybrid maize as a second crop

Effects of planting date and plant density on yield and some physiological characteristics of single cross 550 hybrid maize as a second crop

The Effects of Planting Date and Tillage Practice on Growth and Yield of Maize and Soybean in Rotation with Winter Onion

Introducing summer staple crops to diversify conventional summer paddy rice (Oryza sativa L.) and onion (Allium cepa L.) rotation is important for sustainable agriculture. Herein, we evaluate the effects of planting date (early June to late July) and tillage practice (deep cultivation, DC; conventional tillage, CT) on two maize and soybean cultivars over 4 years (2018–2021) in converted paddy soil in Korea. Due to the growing degree-day differences, the yields of June and July planted crops were 7050 and 5554 total digestible nutrient kg ha−1, respectively, for silage corn, and 7410 and 6473 marketable fresh ear kg ha−1, respectively, for waxy corn. Delaying soybean planting from June to July significantly reduced crops’ yield and interfered with field preparation for the following winter cash crops. The June and July planting yields were 2672 and 2090 kg ha−1, respectively, for large-grain soybean, and 2416 and 1861 kg ha−1, respectively, for small-grain soybean. Deep tillage had no effect on summer crops yield. Additionally, the summer crop growing practice had no residual effect on onion yield. Our study recommends mid to late June planting for growers who wish to introduce maize and soybean in rotation with winter onion in the region.

Effect of varieties and planting dates of bread wheat-lupine intercropping system under additive design in Northwest Ethiopia

AbstractFood production on ever-dwindling agricultural land is a severe problem in Ethiopia, necessitating the adoption of more efficient and sustainable land-use strategies to feed the country's growing population. The benefits of intercropping are known to be limited by a variety of factors such as companion crop sowing date and variety. The present study was therefore initiated to evaluate the effect of varieties and planting dates of lupines in bread wheat-lupine under an additive design intercropping system in Northwest Ethiopia. Field experiments were conducted for two years in Adet and Debre Tabor experimental sites. The treatments consisted of four planting dates of lupines and two varieties of lupine. Moreover, the sole crop of bread wheat (Triticum aestivume L.), local lupine (Lupinus albus L.) and sweet lupine (Lupinus angustiflolius L.) were also included. The experiments were laid out in factorial randomized complete block design (RCBD) with three replications. The results showed that at the Adet experimental site, the highest land equivalent ratio (LER) was recorded in the simultaneous planting of sweet lupine and bread wheat (1.3), followed by the planting of sweet lupine two weeks after bread wheat (1.23). While at Debre Tabor experimental site, the highest LER was recorded in planting sweet lupine two weeks after bread wheat (1.67). A greater area time equivalent ratio (ATER) was reported in the simultaneous planting of sweet lupine and bread wheat (1.29), followed by the planting of sweet lupine after bread wheat (1.22) at the Adet experimental site. A greater ATER was also recorded in the planting of sweet lupine after bread wheat (1.53) had the highest ATER in Debre Tabor, followed by simultaneous planting of sweet lupine after bread wheat (1.39) intercropping. This revealed that sole cropping would necessitate 29 and 53% more area, respectively, to attain the same yield as intercropping. In Adet, the simultaneous planting of sweet lupine and bread wheat intercropping, while in Debre Tabor, planting of sweet lupine two weeks after bread wheat boosted productivity, and production efficiency and is a viable option for increasing household food security.

Evaluation of the effect of planting date and plant density of maternal plant on the quality and germination characteristics of Guar seed (Cyamopsis tetragonoloba) in Guilan province

Evaluation of the effect of planting date and plant density of maternal plant on the quality and germination characteristics of Guar seed (Cyamopsis tetragonoloba) in Guilan province

Phenology, growth, and seed production of junglerice (Echinochloa colona) in response to its emergence time and populations

AbstractJunglerice [Echinochloa colona (L.) Link.] is the most important grass weed species in Australian summer cropping systems. Although it is mainly a spring- and summer-emerging weed species, field observations suggest that E. colona is expanding its seasonality. A common garden experiment was conducted at the University of Queensland farm to examine the effect of planting dates on phenology, growth, and fecundity of eight populations of E. colona. All populations were planted every second month from September to July in 2019 to 2020 and 2020 to 2021. Echinochloa colona took the shortest time (4 to 6 d) to emerge when planted in November or January. However, the November population took the longest number of growing degree days to exhibit panicle emergence. In both years, populations differed in height and leaf, tiller, panicle, and seed production in response to planting times. Plants produced significantly greater biomass for the November planting (123 to 147 g plant−1) followed by the January planting and then the September planting. The March planting produced the lowest biomass. In the first year, the lowest number of seeds (3,500 seeds plant−1) was produced by the March planting; however, in the second year, similar numbers of seeds were produced by the March and July plantings. In the first year, seed production (51,000 seeds plant−1) was greatest for the November planting; however, some populations also produced a similar number of seeds for the January planting. In the second year, significantly greater seed production (111,000 seeds plant−1) was observed for the January planting compared with other planting dates. The aboveground biomass and seed production of E. colona were positively correlated. This study reveals variations among E. colona populations and suggests that although greater emphasis must be placed on controlling spring- and summer-emerging plants, management practices need to be extended throughout the year to control E. colona in southeastern Australia.

Effect of Cultivar and Planting Date on Soybean Response to Dicamba

Off-target movement of dicamba has been blamed for damaging millions of hectares of soybean in the United States since registration of the herbicide for use in dicamba-resistant cotton and soybean. Understanding the effect of a low dose of dicamba on non-dicamba-resistant soybean across multiple cultivars, growth stages, and planting dates could help producers better understand the implication of current management practices on yield loss from dicamba in fields where non-dicamba-resistant soybean are grown. A field experiment was conducted in 2019 in Fayetteville and Stuttgart, Arkansas, to evaluate the impact of planting date on response of soybean to a low dose of dicamba. The hypothesis of the planting date experiment was that soybean injury and yield loss will differ depending on planting date and dicamba application timing. Additionally, an experiment was conducted in 2018 and 2019 in Fayetteville to assess whether cultivars differ in sensitivity to dicamba. The hypothesis of the cultivar experiment was that genetic differences of soybean cultivars will allow for differential tolerance to dicamba. In the cultivar experiment, “Eagle DrewSoy” was identified as having enhanced tolerance to dicamba based on reduced injury (47% at R1 and 26% at V3) over both experimental years and locations. Soybean height in this experiment was affected only by application timing. In the planting date experiment, planting after mid-June resulted in reduced yields from dicamba injury. Dicamba exposure reduced yield at the July planting date (61% reduction from nontreated) more severely when compared to dicamba-treated plots of other planting dates (94% average relative yield among other planting dates), indicating that the negative effects of dicamba are increasingly deleterious for soybean planted later in the growing season. Maximum injury manifestation was generally delayed at later planting dates, indicating that dicamba may have been metabolized more slowly.

Planting Date and Hybrid Affect Sugarcane Aphid Infestation, Yield, and Water Use Efficiency in Dryland Grain Sorghum

Grain sorghum (Sorghum bicolor L.) is a major dryland crop in the Texas High Plains. Currently, drought and infestation by the sugarcane aphid (SCA, Melanaphis sacchari) are the two major challenges to grain sorghum production in the area. A 2-year field study was conducted to investigate the effect of planting date (PD) and hybrid selection on yield, evapotranspiration (ET), water use efficiency (WUE), and SCA infestation. Five sorghum hybrids (86P20, SP-31A15, AG1201, AG1203, and DKS37-07) were grown on two planting dates (PD1—early May; PD2—late June) under dryland conditions. Insecticides were not used. There were significant differences in grain yield, WUE, evapotranspiration (ET), and SCA population between two PDs and among hybrids. For PD1, SCA infestation occurred after sorghum reached physiological maturity in 2017. Although SCA infestation was observed during late grain filling in 2018, SCA populations were low and did not affect yield. For PD2, SCA was present before anthesis in both years and significantly affected grain yield. Even with heavy SCA infestation in PD2, the grain yield was higher in PD2 than in PD1 due to timely precipitation. Among hybrids, AG1203, 86P20 and DK37-07 performed better with higher yield and less SCA infestation in PD2. Grain yield was more related to seeds per plant than to kernel weight and harvest index.

Combined Effect of Planting Date, Organic Fertilization and Cabbage Varieties on Cabbage and Turnip Aphids and their Natural Enemies in Dschang, Cameroon

A study was carried out to evaluate the combined effect of planting date, organic fertilization and cabbage varieties on cabbage and turnip aphids. The randomized complete blocks design with three replications and two varieties were used. Three organic fertilizers; compost (10 t.ha-1); the mixture: poultry manure 25% and compost 75% (10 t.ha-1); poultry manure (10 t.ha-1); the positive control, the mineral fertilizer NPK 20-10-10 (300 kg. ha-1) and the negative control. Aphid and syrphids counting was weekly done from the second week after transplantation to two weeks before harvest. The results obtained showed that Brevicoryne brassicae, Lipaphis pseudobrassicae, are present in all plots. Infestation peaks ranged from 21 to 28 DAT for B. brassicae and between 21 and 35 DAT for L. pseudobrassicae. The abundance of aphids of both species was significantly lower (P=0.0001) in plots with poultry manure compared to plots without fertilization. The dry season was more favourable than the rainy season for both species. B. brassicae was more important in compost plots and mixing on the other hand L. pseudobrassicae was more common in mixing plots. Green Coronet hosted more aphids in both growing seasons than Green Boy, 10.80±2.13 to 23.97±3.13 and 11.13±1.66 to 39.04±2.83 respectively for B. brassicae and L. pseudobrassicae in the dry season and 0.00±0.00 to 2.28±0.97 and 0.06±0.04 to 4.19±0.90 respectively in the rainy season. For average cabbage yields, Green Coronet recorded 15.38 t.ha-1 and Green Boy 16.16 t.ha-1 in the dry and in the rainy seasons, Green Coronet recorded 12.00 t.ha-1 and Green Boy 12.35 t.ha-1. In summary, poultry manure and mixture are recommended because they give the highest yields for both cabbage varieties.

Planting date and cultivar selection to manage southern blight in potatoes in the mid-Atlantic United States

Incidence of southern blight caused by Sclerotium rolfsii Sacc. in potato (Solanum tuberosum L.) has increased across the mid-Atlantic region. To date, no potato cultivar is resistant to southern blight, and effective management with fumigants and fungicides has been inconsistent and uneconomical. This study evaluated impacts of four planting dates, ten commercial cultivars, and integrated effects of planting date and cultivar on southern blight incidence, yield, and tuber quality. Disease incidence varied by year, with fewer occurrences in 2019 (25%) than in 2018 (79%) or 2017 (64%), likely due to dry and warm weather. Despite the planting date by cultivar interaction, later plantings had greater disease incidence (85–94%) and lower tuber yield (1.8–9.4 Mg ha-1) and quality (47–78% marketable tubers) than earlier plantings. Planting date effects were likely driven by humid, warm weather later in the season that was conducive to disease and detrimental to crop development. Though cultivar responses varied across planting date-years, ‘Accumulator’ had the lowest disease incidences (36%) and greatest tuber yield (20.2 Mg ha-1) among tested cultivars. Conversely, ‘Adirondack Blue’ and ‘Dark Red Norland’ had the overall greatest incidence of S. rolfsii (33–100%) while ‘Yukon Gold’ had the lowest yield (0.3–24.1 Mg ha-1). Potato chipping cultivars tended to be less impacted by S. rolfsii than fresh market cultivars; however, additional studies are needed to elucidate potential mechanisms of disease resistance. This study indicates early planting dates and cultivar selection are an effective management approach to reduce S. rolfsii incidence on potato and maximize tuber yield.

Effect of planting dates, spacing and training systems on growth and yield of cucumber (Cucumis sativus L.)

An experiment was conducted to study the effect of different planting dates, spacing and training systems on growth and yield of cucumber (Cucumis sativus L.) under naturally ventilated polyhouseduring the off season 2017 at the Research farm, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur. The treatment comprised of three planting dates, two spacing and three training system were evaluated in factorial randomized block design (FRBD) with three replications. Among the dates of transplanting, 2nd fortnight of March proved significantly superior to 1 stfortnight of March and 1st fortnight of April with respect of vine length (174.2 cm), days to initiation of first female flower (13.5), days to 50% flowering (26.3 days), number of days to first picking (34.6 days). The crop transplanted in first fortnight of March produced the plant with significantly smaller internodal length (9.3 cm) and prolonged harvest duration (59.3 days). Plants grown at wider spacing of 75 cm x 30 cm resulted in significantly smaller internodal length (9.4 cm) and took lesser number of days for initiation of first female flower (14.1 days), days to 50% flowering (28.5 days), days to first picking (36.4 days) and harvest duration (53.9 days) whereas narrow spacing of 60 cm x 30 cm produced significantly higher vine length (171.5 cm) regards to the number of shoots per plants, plants trained to two shoots produced significantly smaller internodal length (9.0 cm), took lesser number of days to 50% flowering (26.6 days), number of days to first picking (36.3 days) while significantly higher vine length (172.1 cm) and prolonged harvest duration (58.8 days) was also recorded with two shoots. In case of fruit yield plants with three shoots, spaced at 60 cm x 30 cm in the 1st fortnight of March recorded significantly higher fruit yield. Interaction effect was found significant for vine length, number of days to first picking and harvest duration.

Effect of planting dates, spacing and training systems on growth and yield of cucumber (Cucumis sativus L.)

An experiment was conducted to study the effect of different planting dates, spacing and training systems on growth and yield of cucumber (Cucumis sativus L.) under naturally ventilated polyhouseduring the off season 2017 at the Research farm, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur. The treatment comprised of three planting dates, two spacing and three training system were evaluated in factorial randomized block design (FRBD) with three replications. Among the dates of transplanting, 2nd fortnight of March proved significantly superior to 1stfortnight of March and 1st fortnight of April with respect of vine length (174.2 cm), days to initiation of first female flower (13.5), days to 50% flowering (26.3 days), number of days to first picking (34.6 days). The crop transplanted in first fortnight of March produced the plant with significantly smaller internodal length (9.3 cm) and prolonged harvest duration (59.3 days). Plants grown at wider spacing of 75 cm x 30 cm resulted in significantly smaller internodal length (9.4 cm) and took lesser number of days for initiation of first female flower (14.1 days), days to 50% flowering (28.5 days), days to first picking (36.4 days) and harvest duration (53.9 days) whereas narrow spacing of 60 cm x 30 cm produced significantly higher vine length (171.5 cm) regards to the number of shoots per plants, plants trained to two shoots produced significantly smaller internodal length (9.0 cm), took lesser number of days to 50% flowering (26.6 days), number of days to first picking (36.3 days) while significantly higher vine length (172.1 cm) and prolonged harvest duration (58.8 days) was also recorded with two shoots. In case of fruit yield plants with three shoots, spaced at 60 cm x 30 cm in the 1st fortnight of March recorded significantly higher fruit yield. Interaction effect was found significant for vine length, number of days to first picking and harvest duration.

Watermelon Planting Decisions with Multiple Risks: A Simulation Analysis

Watermelon [Citrullus lanatus (Thunb.) Matsum. & Nakai] growers choose transplanting dates every year considering multiple risk factors. Earlier harvests linked to earlier planting typically find more favorable markets, but earlier planting has higher risk of freeze damage. Research also indicates that risk of fusarium wilt (caused by Fusarium oxysporum f. sp. niveum) is higher during cooler weather, adding to the risk of planting earlier. Thus, growers need to balance market risk (e.g., getting a low price) and production risk (e.g., lower harvest or higher cost due to freezing temperatures or disease) in selecting a planting date. The objective of this analysis is to examine the effect of planting date on the distribution of potential economic returns and evaluate whether late planting could be a favorable risk-management strategy. Probability distributions are estimated for key risk factors based on input from watermelon growers, published price data, historical freeze data, experiment station trials, and expert discussions. The distribution of economic returns is then simulated for three planting windows (early, middle, and late) using simulation software. Results demonstrate planting date risk–return tradeoffs and indicate that late planting is unlikely to be preferable to middle planting, even when risk of fusarium wilt is high.

Impact of planting dates on yield and pod quality traits of snap bean under short-temperate season climates

Snap bean, a warm-season crop, have low frost tolerance. The optimal temperature for seed emergence and plant growth is important. Therefore, appropriate planting dates for adapted varieties has paramount significance in improving pod yield and quality of snap bean under short cool season climates. Three snap bean cultivars planted at 3 different dates were examined to evaluate the effects of planting dates on snap bean pod yield and quality traits in a 2-year study in a short season climate in Manitoba, Canada. Results of this study showed that three, two weeks apart, planting dates had a non- significant effect on marketing yield of three different cultivars tested in this study. Planting dates showed significant effect on un-marketable yield, pod fresh weight, pod length and total soluble solids. Higher marketable and un-marketable yields along with longer pod length and soluble solids, in all three cultivars, were more profound when seeded at mid and late planting dates. Snap bean grew under higher temperature and accumulated more growing degree days (GDD) when planted in mid June and early July when compared to early June planting. These results conclude that marketable yields of snap bean were not significantly affected by planting dates when seeded-two weeks apart-in shorter growing environments which allow commercial and market gardeners, in northern areas with shorter growing seasons to optimise planting snap bean, without reducing pod yield and quality.

Growth and Yield Performance of Potato Clones under Different Planting Dates

Potato (Solanum tuberosum L.) is the fourth most important crop of Nepal. However, variety and planting methods have been catered for its low productivity in the country. A field trial was conducted at Institute of Agriculture and Animal Science, Lamjung Campus, Nepal from October 2016 to February 2017 to identify the suitable planting time and the best genotype. The trial was laid out in two factorial RCBD with three replications. Planting factors included four planting dates (5th October, 20th October, 4th November and 19th November), while genotypes were two potato clones (Khumal Seto and Kufri Jyoti). The result revealed that the mean effect of planting date and clones both significantly affected percentage emergence, plant height, number of leaves/plant, number and weight of tuber/plant. The maximum yield was obtained from 5th October planting (31.55 t/ha) which was statistically similar to 20th October planting (30.94 t/ha), but the lowest yield was found on 19th November (22.27 t/ha) and was at par with 4th November (22.77 t/ha). The yield of clone Khumal Seto (27.68 t/ha) was at par with Kufri Jyoti (26.09 t/ha). However, interaction effect of two factors significantly influenced percentage emergence, plant height and number of small size (<25 g), medium size (25-50 g) and large size tubers (>50 g), but had no significant difference on overall yield. Delayed planting (19th Nov) of both clones produced the highest percentage of small size unmarketable tuber number. Thus, planting of both clones either on 5th October or 20th October helps to maximize the productivity.

Impact of Cover Crop Planting and Termination Dates on Arthropod Activity in the Following Corn.

Relative to fallow-cash crop rotations, the addition of a cover crop can contribute to greater plant diversity and has the potential to conserve predatory arthropods. The transition of arthropods from a cover crop to a subsequent cash crop depends on several factors, such as cover crop biomass production and weather conditions. Information about the effect of cover crop planting and termination dates on arthropods in a subsequent corn system is limited. A two-year field study was conducted in Nebraska in 2018/2019 and 2019/2020 to evaluate the impact of cover crop planting and termination dates as a source for arthropods in the subsequent corn. A total of 38,074 and 50,626 arthropods were collected in the first and second year, respectively. In both years, adding a grass cover crop increased predatory arthropods but reduced yield in follow corn crop. Of the arthropods collected, Carabidae and Araneae had greater activity with cover crop biomass increments, whereas Collembola and Acari activity only increased in treatments with little or no cover crop biomass. Insect pest pressure was not significant in any treatment for either year. A cover crop planted in mid- or late-September and terminated at corn planting was identified as the best management strategy to maximize cover crop biomass, increase predator activity, and modify predator-prey dynamics. The results of this study provide growers with a cover crop management strategy to maximize cover crop biomass, beneficial arthropod activity, and potentially minimize insect pest problems; however, corn Zea Mays (L.) grain yield was reduced as cover crop biomass increased.

Leaf Carbohydrate Metabolism Variation Caused by Late Planting in Rapeseed (Brassica napus L.) at Reproductive Stage

Delayed planting date of rapeseed is an important factor affecting seed yield. However, regulation of the leaf carbohydrate metabolism in rapeseed by a late planting date at the reproductive stage is scarcely investigated. A two-year field experiment was conducted to assess the effect of planting dates, including early (15 September), optimal (1 October), late (15 October), and very late (30 October), on leaf growth and carbohydrate biosynthetic and catabolic metabolism at the reproductive stage. The results showed that leaf dry matter decreased linearly on average from 7.48 to 0.62 g plant−1 with an early planting date, whereas it increased at first and peaked at 14 days after anthesis (DAA) with other planting dates. Leaf dry matter was the lowest at the very late planting date during the reproductive stage. For leaf chlorophyll content, rapeseed planted at an optimal date maximized at 14 DAA with an average content of 1.51 mg g−1 fresh weight, whereas it kept high and stable at a very late planting date after 28 DAA. For the carbohydrate catabolic system, acid and neutral invertase (AI and NI, respectively) showed higher activity before 14 DAA, whereas both sucrose synthase (SS) and starch phosphorylase (SP) showed higher activity after 14 DAA. For the carbohydrate biosynthetic system, the activity of sucrose phosphate synthase (SPS) was the highest at the late planting date after 14 DAA, whereas it was at the lowest at the very late planting date. However, the activity of ADP-glucose pyrophosphorylase (AGPase) at the late and very late planting dates was significantly higher than that of the early and optimal plant dates after 21 DAA, which is in accordance with the leaf total soluble sugar content, suggesting that leaf carbohydrate metabolism is governed by a biosynthetic system. The current study provides new insights on leaf carbohydrate metabolism regulation by late planting in rapeseed at the reproductive stage.

Postplanting Microclimate, Germination, and Emergence of Perennial Grasses in Wyoming Big Sagebrush Steppe

Several recent studies have hypothesized that postgermination/preemergence soil freezing can have a major negative impact on spring emergence of seeded perennial grasses in the Intermountain western United States. In this experiment, we measured germination and emergence of 4 fall-seeded perennial grasses at 15 sites in southeastern Oregon, north-central Nevada, and southwestern Idaho in 2 different yr. We used hydrothermal germination and seedbed microclimatic models to estimate planting date effects on germination and preemergence mortality and evaluated these simulations relative to measured germination and seedling emergence in the field. There were clear indications that both germination and emergence were responsive to site-year effects, but premature fall germination before winter freezing events was not a factor in emergence rates. In all cases, planting was sufficiently late in the fall to avoid significant postgermination/preemergence freezing injury for the sites and years tested. Emergence was weakly correlated to seedbed favorability in the late winter and spring after the principal period of soil freezing. Our data show that for the 2 yr of this study, we can only account for a relatively small portion of any abiotic effects on spring emergence. General inferences about planting date effects, however, may have been limited by arid conditions during the 2-yr field study relative to long-term climate normals.

How bean fly, Rhizoctonia root rot, weed and productivity are affected by cultivar, herbicide application and planting date

A 2-year research was conducted to evaluate the effects of bean cultivar, herbicide and planting date on a plot scale in Zanjan Province, Iran. Weeds across plots were identified as 26 species. Weed density was often lower for the fourth planting date (25–30 June) than the first date (10–15 May) of Imazethapyr, Trifluralin, hand-weeding and control at seedling, flowering and maturity stages of bean growth. At seedling and flowering, there was a greater Rhizoctonia root rot incidence on the first planting date than the fourth date. Postponing cultivation to the fourth planting date decreased mean disease incidence up to 93% at flowering in 2014 and 75% at maturity in 2015. There were greater mean fly infestation ratings at the third (2014) and fourth (2015) planting dates of treatments. Fly infestation was lacking in beans planted at the second date of cultivar and herbicide treatments examined in 2015. Postponing planting from the first date to the fourth one increased mean plant dry matter up to 162% at flowering in 2015. The highest number of pods per plant and seeds per pod were recorded for the third (2014) and first-second (2015) planting dates. This study recommends a postponed planting to minimize disease, herbicide use and weed threats, and thus produce beans in sustainable agriculture.

Studies of Evaluation Methods for Resistance to Fusarium Wilt Race 4 (Fusarium oxysporum f. sp. vasinfectum) in Cotton: Effects of Cultivar, Planting Date, and Inoculum Density on Disease Progression.

Fusarium wilt caused by Fusarium oxysporum f. sp. vasinfectum race 4 (FOV4) is an early season disease causing root rot, seedling wilt, and death. To develop an appropriate field evaluation method for resistance to FOV4 in cotton breeding, the objectives of this study were to investigate the effects of cultivar, planting date, and inoculum density on disease progression in 2020–2021. Results showed that the usual local mid-April planting had the lowest disease severity (DSR) or mortality rate (MR) in 2020 and 2021. DSR or MR increased at the late April and early May plantings in both years and reached the highest at the early May planting in 2020, while MR in 2021 was followed by a decrease in the late May planting and reached the highest in the mid-June planting. Local daily low temperatures between mid-April and mid-June were favorable for FOV4 infections, whereas daily high temperatures at 35°C or higher suppressed wilt severity. When seedlings at the 2-true leaf stage were inoculated with 104, 105, 106, and 107 conidia ml−1 per plant in 2020, DSR was low but a linear relationship between inoculum density and DSR was observed. When a FOV4-infested soil supplemented with artificial inoculation was used, disease progression in three moderately susceptible or moderately resistant cultivars followed a linear model, while it followed a quadratic model in the highly susceptible Pima S-7 cultivar only. Among the other three cultivars, FM 2334GLT had the lowest DSR or MR except for one planting date in both years, followed by PHY 725 RF and Pima PHY 881 RF in ascending order, which were consistent with the difference in regression coefficients of the linear models. This study demonstrates that disease progression curves due to FOV4 can be used to compare responses to FOV4 infections among cotton genotypes in cotton breeding and genetic studies, regardless of planting date and inoculation method.