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Sowing

About: Sowing is a research topic. Over the lifetime, 33888 publications have been published within this topic receiving 273438 citations. The topic is also known as: seeding.


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Journal ArticleDOI
TL;DR: In this paper, the effect of N application time on dry matter accumulation, N uptake, and grain yield of corn grown in a winter legume conservation-tillage system was investigated.
Abstract: Fertilizer N efficiency of corn (L.) in conservation-tillage systems with winter legumes such as crimson clover (L.) can possibly be improved by better synchronization of legume-N release, fectftizer-N application time, and crop demand for N. The objective of this 3-yr (1986-1988) field experiment was to determine the effect of N application time on dry matter accumulation, N uptake, and grain yield of corn grown in a winter legume conservation-tillage system. Corn was planted with unit planters into crimson clover residue following in-row subsoiling. The clover was killed at midbloom every year. Treatments were a factorial arrangement of fertilizer N rates and application time. Nitrogen as NHNO was broadcast at rotes of 34, 67, and 134 kg ha. Zero-N checks were also included in both clover and rye (L.) plots. Application times were at planting, or 3, 6, or 9 wk later. In addition, split applications (1/3 at planting and the remainder 6 wk later) of the 67 and 134 kg N ha rates were included. In 2 of 3 yr, dry matter accumulation was not affected by N application time. In 1987, however, dry matter production was greater when N was applied at planting compared to split applications or applications later than 3 wk after planting. Application time affected N uptake patterns during the growing season, but generally did not affect total N uptake at the end of the season. With the exception of the first year, split N applications resuited in equivalent or reduced N uptake compared to application of all N at planting. Based on linear regression models, maximum yield was obtained with 134, 116, and 93 kg N ha in 1987, 1988, and 1989, respectively. After the first year, applying N later than 6 wk after planting reduced grain yield and split applications of N were not effective in increasing grain yield. These results suggest that the fertilizer N requirement of corn grown in winter legume conservationtillage systems on Coastal Plain softs decreases with successive years in the system and that the optimum management practice for conservation of N, energy, time, and labor would be to apply all fertilizer N at planting.

67 citations

Journal ArticleDOI
TL;DR: In this paper, a 4-year field study (1992/1993 to 1995/1996) on a deep clay soil in northern Syria assessed the impact of supplemental irrigation (SI), improved varieties, nitrogen (N) and sowing dates.

67 citations

Journal ArticleDOI
TL;DR: In the field experiment and survey data, irrespective of sowing time, roots did not penetrate as far down the profile as might be expected, given reported rooting depths commonly in excess of 200 cm on similarly textured soils as mentioned in this paper.
Abstract: In 1986 and 1987 wheat was sown in an experiment at the Mallee Research Station, Walpeup, at 2 times of sowing and with 3 rates of applied nitrogen. Soil cores were taken and trenches excavated to 1.5 m to measure wheat root growth and depth of rooting. Wheat roots penetrated to a maximum depth of 104 cm in crops sown in May, the optimum time of sowing for maximum yield, while delayed sowing reduced total root biomass and limited rooting depth to 73-83 cm. The application of nitrogen fertiliser did not affect either the rooting depth or growth and yield. Significant changes in total soil water content between sowing and harvest only occurred in 1987 with the early and late sown crops reducing the total soil water content by 47 and 99 mm respectively. In 1986, above average rainfall during the growing season caused the early sown crop to accumulate more water below 50 cm than the late sown crop. While total water use was increased only in 1986 with early sowing, crop water use efficiency and yield was greater in both years. The addition of nitrogen had no effect on crop water use or water use efficiency. A survey of wheat crops carried out in 1988 on 10 Mallee farms also found that shallow rooting is widespead. The field experiment and survey data show that, irrespective of sowing time, roots did not penetrate as far down the profile as might be expected, given reported rooting depths commonly in excess of 200 cm on similarly textured soils. This was shown to be associated with high soil pH and salt content. Poor rooting depth of wheat in this environment will restrict the use of stored water and accordingly, calls the practice of fallowing into question.

67 citations

Journal ArticleDOI
01 Dec 1989-Ecology
TL;DR: Investigation of the effects of seed density, relative frequency, and relative planting date on the emergence of seedlings in the species Senecio vulgaris, Capsella bursa-pastoris, and Poa annua found that the probability of emergence significantly decreased with an increase in total seed density.
Abstract: The interactions between seeds in the soil are poorly understood. We per- formed greenhouse experiments to investigate the effects of seed density, relative frequency, and relative planting date on the emergence of seedlings in the species Senecio vulgaris, Capsella bursa-pastoris, and Poa annua. We found that for both Poa and Senecio, the probability of emergence significantly decreased with an increase in total seed density. Neither the density of conspecifics nor heterospecifics alone could explain this decline in the probability of emergence. We also found that, for all three species studied, the rate of emergence accelerated in the presence of previously planted seeds. A second experiment indicated that this acceleration involves a response to leachate from previously germinated seeds.

66 citations

Journal ArticleDOI
TL;DR: In field experiments, bio-priming and coating with Pseudomonas fluorescens AB254 consistently protected sweet corn seeds from preemergence damping-off caused by Pythium ultimum Trow.
Abstract: In field experiments, bio-priming and coating with Pseudomonas fluorescens AB254 consistently protected sweet corn (Zea mays L.) seeds from preemergence damp- ing-off caused by Pythium ultimum Trow. The bio-priming seed treatment was evalu- ated under various disease pressures and with seeds of three sweet corn genotypes: shrunken-2 supersweet (sh-2), sugary enhancer (se), and sugary (su). While no damping- off occurred in the su sweet corn, bio-priming protected sh-2 and se sweet corn seeds at a level equivalent to that obtained by treatment with the fungicide metalaxyl. Bio- priming increased seedling height of all three sweet corn genotypes at 4 weeks post- planting. Coating of sweet corn seeds with P. fluorescens AB254 provided an equivalent degree of protection from damping-off under all but the most severe conditions.

66 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20232,551
20225,773
2021919
20201,657
20192,181