• Journal of Bio-Environment Control
• /
• v.25 no.2
• /
• pp.106-110
• /
• 2016

In this study, a planting density-growth-harvest (PGH) chart was developed to easily read the growth and harvest factors such as crop growth rate, relative growth rate, shoot fresh weight, shoot dry weight, harvesting time, marketable rate, and marketable yield of common ice plant (Mesembryanthemum crystallinum L.). The plants were grown in a nutrient film technique (NFT) system in a closed-type plant factory using fluorescent lamps with three-band radiation under a light intensity of $140{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ and a photoperiod of 12 h. Growth and yield were analyzed under four planting densities ($15{\times}10cm$, $15{\times}15cm$, $15{\times}20cm$, and $15{\times}25cm$). Shoot fresh and dry weights per plant increased at a higher planting density until reached an upper limit and yield per area was also same tendency. Crop growth rate, relative growth rate and lost time were described using quadratic equation. A linear relationship between shoot dry weight and fresh weights was observed. PGH chart was constructed based on the growth data and making equations. For instance, with within row spacing (= 20 cm) and fresh weight per plant at harvest (= 100 g), we can estimate all the growth and harvest factors of common ice plant. The planting density, crop growth rate, relative growth rate, lost time, shoot dry weight per plant, harvesting time, and yield were $33plants/m^2$, $20g{\cdot}m^{-2}{\cdot}d^{-1}$, $0.27g{\cdot}g^{-1}{\cdot}d^{-1}$, 22 days, 2.5 g/plant, 26 days after transplanting, and $3.2kg{\cdot}m^{-2}$, respectively. With this chart, we could easily obtain the growth factors such as planting density, crop growth rate, relative growth rate, lost time and the harvest factors such as shoot fresh and dry weights, harvesting time, marketable rate, and marketable yield with at least two parameters, for instance, planting distance and one of harvest factors of plant. PGH charts will be useful tools to estimate the growth and yield of crops and to practical design of a closed-type plant production system.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.25 no.3
• /
• pp.35-40
• /
• 1980

In order to evaluate the fluctuation of soybean aphid (Aphis glycines Matsumura) population, six leading soybean cultivars were planted on five different planting dates with three plant spacings. The survey of aphid population and climatical condition were made from June through September in 1978. According to the differences of planting dates and plant spacings the soybean aphid populations were varied, and varietal response to the aphid was significantly different. Counting of aphid infestation on top third trifoliolate leaf seemed to be efficient for the estimation of soybean aphid population.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.27 no.3
• /
• pp.254-260
• /
• 1982

Ten soybean varieties were cultivated to know the varietal differences of lodging patterns of soybean plants under three different plant populations in two growing seasons in 1981. Lodging plant percentage was increased in higher plant populations and lodging responses to plant populations were different between soybean varieties. Lodging plant percentage was also increased by the growth of soybean plant and the patterns of lodging development along with the growth stages could be classified into four types by the varieties used, relatively lwoer iodging plant percentage from early to later growth stage but high in late and relatively high in middle stage but low in later stage. Williams, indeterminate type, and Kang-lim, determinate type, showed resistance to lodging under six different cultural practices, but Jang-yeop-kong, Dan-yeop-kong and Hwang-keum-kong showed resistance to lodging under specific cultural conditions among ten varieties used. Most of the plants lodged showed main stem bending in parts above first stem node in higher plant population and lodging resistant varieties showed lower frequency of stem bending lodging compared with those of lodging susceptible varieties.

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 2000.10b
• /
• pp.33-33
• /
• 2000

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2022.04a
• /
• pp.54-54
• /
• 2022

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2022.04a
• /
• pp.28-28
• /
• 2022

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2021.10a
• /
• pp.46-46
• /
• 2021

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.36 no.2
• /
• pp.177-184
• /
• 1991

Soybean cultivars for bean sprouting, and for cooking with rice are related closely with Korean dietary tradition, but their yields have been kept in low level. The yielding responses of Danyup, a cultivar for bean sprouting and Gumjung, a cultivar for cooking with rice were compared with Paldal as standard cultivar in planting density within 10 to 80 plants per ㎡. Yield of Paldal increased as planting density increased from 10 plants up to 80 plant/㎡. But, Danyup reached at threshold as planting density reached up to 40 plants/㎡. Gumjung did not have significant difference in yield within planting density. Danyup had the highest yield, 445 kg/l0a at 80 plants/㎡. The highest yield of Paldal was 406kg/10a at 40 plants /㎡ while Gumjung had 373kg/ l0a at 40 plants. The yield responses of cultivars were influenced by canopy structure and light utilization. Paldal had short and straight canopy with determinate growth habit responded well at the heavy density, and had 6.2 in critical LA!. But Gumjung, tall and dense canopy with indeterminate growth habit had limited utilization of light within canopy with 5.4 in critical LAI and high rate of lodging. Gumjung was concluded as a low yielding cultivar, since it did not have good response to increasing source size and sink number.

• Proceedings of the Korean Society of Crop Science Conference
• /
• 1988.02a
• /
• pp.46-47
• /
• 1988

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.4 no.1
• /
• pp.73-79
• /
• 1968

In order to investigate varietal competition effects on yield of rice, two experiments were conducted under paddy field condition. In experiment I, two leading varieties were grown in pure and mixed stands and examined the influence of spacings and nitrogen levels on the varietal competition effects and competitive ability of two varieties. In experiment II, three leading varieties were grown in pure and mixed stands with different combinations and examined the competition effects on yield in different combinations. The results are summarized as follows: 1. No significant differences were found in grain yield between varietal mixture and pure stands, though the level of nitrogen and spacings affected plot yield. 2. In the mixture of Suwon ＃82 and Shin ＃2, Suwon ＃82 appeared to be a better competitor to the Shin #2 in terms of grain yield. 3. The performance of mixtures were determined by the balance of the increment of better competitor and the decrement of poorer competitor. Here, the increment of Suwon ＃82 due to competition did not much exceeded the decrement of Shin ＃2. 4. Spacings and Nitrogen levels, tested here, did not affect significantly to the varietal competition effects. 5. Jaekun, Paltal and Norin ＃6 showed no varietal difference in competing ability.