scholarly journals Canopy height‐to‐row spacing ratio as a simple and practical onsite index to determine the time for terminating Ipomoea coccinea control in the Japanese soybean‐growing systems

2015 ◽  
Vol 15 (3) ◽  
pp. 113-121 ◽  
Author(s):  
Shunji Kurokawa ◽  
Makita Hajika ◽  
Tomoko Shibuya
Keyword(s):  
Canopy Height ◽  
Row Spacing ◽  
Spacing Ratio ◽  
Ipomoea Coccinea

Evaluation of validity and limitations of the soybean canopy height‐to‐row spacing ratio as an onsite index to control weeds using diverse soybean accessions

2019 ◽  
Vol 19 (3) ◽  
pp. 103-110
Author(s):  
Shunji Kurokawa ◽  
Akito Kaga ◽  
Mai Tsuda ◽  
Daisuke Sekine ◽  
Tomoko Shibuya
Keyword(s):  
Canopy Height ◽  
Row Spacing ◽  
Spacing Ratio ◽  
Soybean Canopy

Corn Row Spacing, Plant Density, and Maturity Effects

2003 ◽  
Author(s):  
Kenneth T. Pecinovsky ◽  
Garren O. Benson ◽  
Dale E. Farnham
Keyword(s):  
Plant Density ◽  
Row Spacing

Corn Row Spacing

2016 ◽  
Author(s):  
Josh Sievers ◽  
Mark Licht
Keyword(s):  
Row Spacing

EFFECT OF NITROGEN FERTILIZER DOSE AND ROW SPACING ON AMARANTH PRODUCTIVITY

2019 ◽  
Keyword(s):  
Animal Husbandry ◽  
Dry Weight ◽  
Nitrogen Fertilizers ◽  
Row Spacing ◽  
Cereal Aphid ◽  
Perennial Weeds ◽  
Food And Feed ◽  
Leaf Surface Area ◽  
Cultivation Technology ◽  
Photosynthetic Potential

Amaranth is a valuable food and feed crop that can solve the problem of vegetable protein in animal husbandry. The aim of the research was to study elements of amaranth cultivation technology: the dose of nitrogen fertilizers (without fertilizers, N15, N20, N25) and the row spacing (15, 30, 45 cm). The work was carried out on sod-podzolic medium loamy gleyic soil on the experimental field of FSBEI HE Yaroslavl State Agricultural Academy in 2018. The studied parameters were determined according to generally ac-cepted methods. The use of nitrogen fertilizers contributed to a significant increase in leaf area and pho-tosynthetic potential of amaranth crops at the highest values of the background N20 – 4.7 thousand m2 / ha and 324.08 thousand m2 / ha × days, respectively. Increase in row spacing when sowing amaranth raised the leaf surface area value, accumulation of dry aboveground mass, photosynthetic potential, ger-mination and safety at maximum values in the variant with a row spacing of 45 cm. abundance of weed flea, cereal aphid and sunflower fire. Sowing amaranth with a width of 45 cm between rows caused a sta-tistically significant decrease in the number of studied pests, as well as the number and dry weight of young and perennial weeds. The use of nitrogen fertilizers in a dose of 25 kg AI / ha contributed to a sig-nificant decrease in the yield of amaranth green mass from 145.12 q / ha on the «no-fertilizer» variant to 127.93 q / ha, with maximum values for the background N20 – 156, 55 kg / ha. Thus, the greatest effi- 128 ciency was shown by the introduction of nitrogen fertilizers at a dose of 20 kg ai / ha when sown with a row spacing of 45 cm.

INFLUENCE OF METHODS FOR SELECTION OF PLANTS AND WAYS OF SEEDING ON EFFICIENCY OF ORIGINAL SEEDS OF FLAX-DOLGUNETS GRROWING IN PRIMARY SEED BREEDING

2020 ◽  
Keyword(s):  
Seed Yield ◽  
Control Level ◽  
Row Spacing ◽  
High Germination ◽  
Breeding Efficiency ◽  
Flax Seeds ◽  
Narrow Row ◽  
Seed Propagation ◽  
Selection Of

The results of scientific research are presented, which made it possible to develop less labor-intensive methods for selecting flax plants to grow original (updated) seeds. Studies have shown that a positive selection of tall plants of flax, compared with the accepted counterpart (control), increased seed yield 1.7-1.9 times. Moreover, plant homogeneity according to the main characteristics (height and fiber content in the stem) characterizing the varietal quality of grown seeds turned out to be at the control level. A negative selection, involving the removal of atypical plants, provided an increase in the output volume of seeds compared to the control by 3.9-4.1 times. This selection method did not reduce the varietal quality of seed material compared to the accepted analogue. With both selection methods, after combining typical plants, seeds with the same high germination rates were obtained (96-99 %). The breeding efficiency of the grown flax seeds using narrow-row sowing methods is shown. Studies have established that narrow-row sowing of seeds with a row-spacing of 7.5 and 6.25 cm compared with sowing by a wide-row method significantly increased their yield by 2.8-3.0 and 2.3-3.0 kg / ha, respectively. The greatest influence on the formation of seed yield in narrow-row sowing (6.25 cm) was exerted by the method of sowing, the part of which was 76.1 %. As the length of seed propagation of flax in creased (up to the uterine elite 2 years) in narrow-row sowing (6.25 cm) compared to broad-row, there was no decrease in quality indicators - germination and seed strength.

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