• Title, Summary, Keyword: Nutrient Supply

Search Result 356, Processing Time 0.051 seconds

Effects of the Limited Nutrient Supply at the Pollination Stage on the Growth and Nutrient Uptake of Muskmelon Grown in Rockwool (온실멜론의 암면재배에 있어서 수분기의 양분공급제한이 생육 및 양분흡수에 미치는 영향)

  • 장홍기;정순주
    • Protected Horticulture and Plant Factory
    • /
    • v.6 no.1
    • /
    • pp.27-33
    • /
    • 1997
  • This experiment was carried out to investigate the effects of limited nutrient supply during 21 days before and after pollination stage on the growth, fruit quality and nutrient uptake of muskmelon in rockwool culture. Muskmelon, cv. Earl's Favorite seeds sowed on rockwool cube and transplanted on rockwool slab($90\times15\times7.5cm$) when 2 to 3 true leaf appeared on Sep. 6, 1991. Three kinds of nutrient composition recommended by Shizuoka university, combinated with the composition of Otsuka house A and composition Shizuoka III. One half of calcium nitrate(Ca(NO$_3$)$_2$.4$H_2O$) for limiting nitrogen supply during 21 days was treated and then fertigated the nutrient composition recommended by Shizuoka university up to harvest time. Trickling nozzles(Netafim Co. Israel) were used for fertigation of nutrient solution and noncirculating system was employed. Temperature was maintained $18^{\circ}C$ in night but 23 to $25^{\circ}C$ for 10 days after pollination for softening the fruit. The drainage ratio of nutrient solution was adjusted 20 to 30 percent. Fertigated and drained amount, and the pH and EC of nutrient solution were recorded. The concentrations of mineral elements including N, P, K, Ca, and Mg were analyzed and compared among treatments. In both autumn and winter cultivation, the limitation of nutrient supply by adjustment of nutrient composition(NO$_3$-N : 8meㆍ$\ell^{-1}$) caused the nutrient deficiency in muskmelon plant due to the limited nutrient supply. After pollination nutrient limitation by the lowering the nitrate retarded the over thickening of upper leaves of muskmelon but plant height and fresh weight of fruit were higher in the plot of nonlimited nutrient supply. The phenomena were attributed to the differences of the amount of nutrient uptake due to the limited time of nutrient solution, duration of nutrient supply and concentration of nutrient solution. These results suggested that increasing nutrient supply in the pollination stage was favorable for better appearance of fruit and improving fruit quality. Further trials would be required for the incre-ment of sugar degree of muskmelon grown in rockwool.

  • PDF

Optimum Concentration of Supply Nutrient Solution in Hydroponics of Sweet Pepper using Coir Substrates (코이어 배지를 이용한 착색단고추 수경재배 시 적정 급액농도)

  • Kim, Ho-Cheol;Cha, Seung-Hoon;Kim, Chul-Soo;Lee, Hye-Jin;Lee, Yong-Beom;Bae, Jong-Hyang
    • Protected Horticulture and Plant Factory
    • /
    • v.17 no.3
    • /
    • pp.210-214
    • /
    • 2008
  • This experiment was carried out investigation of optimum concentration of supply nutrient solution in hydroponics of sweet pepper using coir substrates (coconut dust fiber=70% : 30%, v/v). During the growing period, it was found out that the electric conductivity (EC) would increase in proportion to the supply nutrient concentration but it was in inverse proportion to the moisture content. The pH of drainage was stable, while EC was high showing EC $7.3\;dS{\cdot}m^{-1}$ in EC $4.0\;dS{\cdot}m^{-1}$ of supply nutrient concentration. Also, standard deviation and coefficient of variation were high. Plant length was no difference by the supply nutrient concentration. Photosynthesis rate was generally high in supply nutrient concentration EC$4.0\;dS{\cdot}m^{-1}$. Fruit weight was heavy in supply nutrient concentration EC $4.0\;dS{\cdot}m^{-1}$, fruit shape was close to a regular square in supply nutrient concentration EC $3.5dS{\cdot}m^{-1}$.

Bush Growth and Fruit Quality of 'Duke' Blueberry Influenced by Nutrition Supply Periods in Unheated Plastic House (무가온 하우스 재배 '듀크' 블루베리에 대한 양분공급시기가 수체생육, 과실품질, 수량에 미치는 영향)

  • Cheon, Mi Geon;Lee, Young Suk;Kim, Young Bong;Kumarihami, H.M. Prathibhani C.;Kim, Jin Gook
    • Protected Horticulture and Plant Factory
    • /
    • v.29 no.4
    • /
    • pp.421-427
    • /
    • 2020
  • In this study, we investigated the effect of nutrient supply periods on the fruit growth and quality of 'Duke' blueberry. The nutrient solution was contained with NO3-N 4.6, NH4-N 3.4, PO4-P 3.3, K 3.0, Ca 4.6, and Mg 2.2 mmol·L-1, and EC in the nutrient solution was 1.5 ds.m-1. In 2017 and 2018, an individual blueberry bush was supplied with 8 L of the nutrient solution per week. In 2018, the drainage water quality of growing medium and fruit quality was investigated. The nutrient supply was started from April 01, and stopped at 15 days intervals as follows, 15 days before final harvest, at the final harvest date (June 30), 15 days after final harvest (DAFH), 30 DAFH, 45 DAFH, and 60 DAFH. The content of inorganic components in the growing medium was not significantly different by the stop time of nutrient supply, but the content of phosphorus (P2O5) tended to increase with the delay of stop time of nutrient supply. There were no significant differences in the fruit quality characteristics in terms of size, sugar content, and acidity among the different stop time of nutrient supply. The blueberry yield was tended to decrease with the delay of periods of nutrient supply, while the lowest yield of 1.8 kg was recorded when nutrient supply stopped at 45 and 60 DAFH.

Modeling Nutrient Supply to Ruminants: Frost-damaged Wheat vs. Normal Wheat

  • Yu, Peiqiang;Racz, V.
    • Asian-Australasian Journal of Animal Sciences
    • /
    • v.23 no.3
    • /
    • pp.333-339
    • /
    • 2010
  • The objectives of this study were to use the NRC-2001 model and DVE/OEB system to model potential nutrient supply to ruminants and to compare frost damaged (also called "frozen" wheat with normal wheat. Quantitative predictions were made in terms of: i) Truly absorbed rumen synthesized microbial protein in the small intestine; ii) Truly absorbed rumen undegraded feed protein in the small intestine; iii) Endogenous protein in the digestive tract; iv). Total truly absorbed protein in the small intestine; and v). Protein degraded balance. The overall yield losses of the frozen wheat were 24%. Results showed that using the DVE/OEB system to predict the potential nutrient supply, the frozen wheat had similar truly absorbed rumen synthesized microbial protein (65 vs. 66 g/kg DM; p>0.05), tended to have lower truly absorbed rumen undegraded feed protein (39 vs. 53 g/kg DM; p<0.10) and had higher endogenous protein (14 vs. 9 g/kg DM; p<0.05). Total truly absorbed protein in the small intestine was significantly lower (89 vs. 110 g/kg DM, p<0.05) in the frozen wheat. The protein degraded balance was similar and both were negative (-2 vs. -1 g/kg DM). Using the NRC-2001 model to predict the potential nutrient supply, the frozen wheat also had similar truly absorbed rumen synthesized microbial protein (average 56 g/kg DM; p>0.05), tended to have lower truly absorbed rumen undegraded feed protein (35 vs. 48, g/kg DM; p<0.10) and had similar endogenous protein (average 4 g/kg DM; p>0.05). Total truly absorbed protein in the small intestine was significantly lower (95 vs. 108 g/kg DM, p<0.05) in the frozen wheat. The protein degraded balance was not significantly different and both were negative (-16 vs. -19 g/kg DM). In conclusion, both models predict lower protein value and negative protein degraded balance in the frozen wheat. The frost damage to the wheat reduced nutrient content and availability and thus reduced nutrient supply to ruminants by around 12 to 19%.

Assessment of Agricultural Nutrient Surplus in Pig-concentrated Region in Korea

  • Lee, Yejin;Yun, Hong-Bae
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.46 no.6
    • /
    • pp.482-486
    • /
    • 2013
  • Assessment of nutrient balance in region unit is important to make a decision on nutrient management in agriculture. In this study, the nutrient demand in arable land and nutrient supply from livestock manure and chemical fertilizer were estimated from pig-concentrated areas. Three regions (H, I and J) were selected on the basis of pig numbers per unit area of arable land. In H and I regions, nitrogen amount from pig manure occupied about 50% of total livestock manure. Nutrient supply was three times higher compared to the nutrient demand in each of 3 regions. Soil available phosphate of higher pig-populated area in regional unit was higher than less populated livestock area. Therefore, livestock manure-derived regional management and monitoring of soil nutrient contents is necessary for the minimization and improvement of nutrient surplus.

The Forecasting Model of the Change in Food Balance and Nutrient Intake under the Economic Growth (경제성장에 따른 식품수급 및 영양소 섭취 변화의 예측 모형)

  • Lee, Jong-Mee
    • Journal of the Korean Society of Food Culture
    • /
    • v.5 no.4
    • /
    • pp.481-485
    • /
    • 1990
  • This study is designed to forecast the characteristics in food consumption patterns under per capita GNP growth. Ordinary least square(OLS)method was employed as analyzing technique. Equation was $Y=a_0+a_1X$, in which X was per capita GNP and Y were Engel coefficient, food supply, energy supply, nutrient intake and ratio of self-supply of food. The result obtained indicates that the intake of nutrient such as protein and fat will be increased, and wheat, corn and legume are expected to be imported wholly due to lower ratio of self-supply, and rice will be over-supplied continually. Therefore, the relevant policy of government must be established in the field of supply and demand of food, and the research of sound national health should be done.

  • PDF

Development of an Automatic Nutrient-Solution Supply System Using Fuzzy Control (퍼지제어를 이용한 양액 자동공급 시스템 개발)

  • 황호준;류관희;조성인;이규철;김기영
    • Journal of Biosystems Engineering
    • /
    • v.23 no.4
    • /
    • pp.365-372
    • /
    • 1998
  • This study was carried out to develop a nutrient-solution mixing-and-supplying system, which used a low-cost metering device instead of expensive metering pumps and a fuzzy logic controller. A low cost and precise overflow-type metering device was developed and evaluated by testing the flow discharge for the automatic nutrient-solution mixing-and-supplying system for snail-scale hydroponic sewers. The fuzzy logic controllers, which could predict and meet the desired values of EC and supply rate of nutrient solution were developed and verified by simulation and experiment. this fuzzy logic controller, whose algorithm consists of four crisp inputs, two crisp outputs and nine rules, was developed to predict the desired value of EC and supply rate of nutrient solution and two crisp inputs, one crisp output and nine rules used to control EC to the desired values. The nutrient-solution mixing-and-supplying system showed satisfactory EC control performance with the maximum overshooting of 0.035 mS/cm and the maximum settling time of 15 minutes in case of increasing 0.7 mS/cm. also, the accuracy of the overflow-type metering device in terms of the full-scale error was 2.29% when using solenoid valve only and 0.2% when using solenoid valve and flow control valve together.

  • PDF

High Cell Density Culture of Anabaena variabilis with Controlled Light Intensity and Nutrient Supply

  • Yoon, Jong-Hyun;Shin, Jong-Hwan;Ahn, Eun-Kyung;Park, Tai-Hyun
    • Journal of Microbiology and Biotechnology
    • /
    • v.18 no.5
    • /
    • pp.918-925
    • /
    • 2008
  • Controlling the light energy and major nutrients is important for high cell density culture of cyanobacterial cells. The growth phase of Anabaena variabilis can be divided into an exponential growth phase and a deceleration phase. In this study, the cell growth in the deceleration phase showed a linear growth pattern. Both the period of the exponential growth phase and the average cell growth rate in the deceleration phase increased by controlling the light intensity. To control the light intensity, the specific irradiation rate was maintained above $10\;{\mu}mol/s/g$ dry cell by increasing the incident light intensity stepwise. The final cell density increased by controlling the nutrient supply. For the control of the nutrient supply, nitrate, phosphate, and sulfate were intermittently added based on the growth yield, along with the combined control of light intensity and nutrient concentration. Under these control conditions, both final cell concentration and cell productivity increased, to 8.2 g/l and 1.9 g/l/day, respectively.

Nutrition requirements in child and adolescent athletes (소아청소년의 스포츠 영양)

  • Park, Jae Ock
    • Clinical and Experimental Pediatrics
    • /
    • v.52 no.12
    • /
    • pp.1327-1336
    • /
    • 2009
  • Increasing numbers of children and adolescents prefer undertaking physical exercise to overcome overweight or obesity. Children and adolescents are in the growth stage and require adequate nutrient supply. More calories and nutrients are required especially when they are engaged in physical exercise. Exercise is the only means to increase lean body mass and decrease body fat, but adequate nutrient supply is also essential. Lack of adequate nutrient supply causes muscle mass loss, menstruation irregularity, reduced bone density, fatigue, or frequent injury in children undertaking physical exercise. Here, I have introduced some guidelines on the nutrient requirement for child and adolescent athletes.

Design and Implementation of An Automatic Nutrient Solution Control System (양액 자동 공급 제어 시스템의 설계 및 구현)

  • Jeong Won-Geun;Lee Byeong-Ro;Kim Byungcheul
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.9 no.5
    • /
    • pp.1059-1065
    • /
    • 2005
  • In this study, an nutrient solution control system have been designed and implemented, which controls the density of nutrient and the nutrient supply automatically using embedded real time operating system and fuzzy control algorithm. The factors which affect the growth of crop consist of solar radiation, external temperature, and external humidity. Also, nutrient temperature, electric conductivity(ED, and pH are monitored. According to the surveyed results, a fuzzy control algorithm for nutrient control is developed in order to control the density of nutrient and the nutrient supply. The exclusive embedded controller which consists of an embedded real time operating system, a korean LCD, and a graphic is developed for common users.