선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- During the study, the temperature, relative humidity, carbon dioxide (CO2) concentration, and photosynthetically active radiation (PAR) were recorded every 30 minutes using anALMEMO® 2890-9 device (AHLBORN, Holzkirchen,Germany), which has both data processing and compiler systems.
- 2 (SAS Institute, Cary, North Carolina, USA). The experiment was set up using a randomized complete block design for four replications. Mean separation of measurement variables used Duncan’s Multiple Range Test(DMRT) at the 5% level.
- Therefore, the purpose of this study was to examine a technique for scheduling irrigation using the FDR sensor aimed at avoiding effluent from an open hydroponic system with coir substrate containing different percentages of chips and dust, two-story coir substrates with different percentages of chips in the lower layer and dust in the upper layer, and commercial rockwool substrate. The key objectives were to undertake preliminary measurements of irrigation volumes, volumetric water content and electrical conductivity (EC) in the substrate, growth and fruit yield of tomato, and water use efficiency resulting from variation in chip content as an initial experiment.
- The water content of the substrate monitored by the FDR sensor was quantified as the internal capacitance of the substrate using high-frequency pulses, while the EC value was quantified as both the internal capacitance and resistance value using low-frequency multiple pulses, which allows measurement of both the water content and ion concentration in the substrate at the same time. The voltage values for the water content and ion concentration were calculated by assessing different numbers of high-frequency pulses returned after converting the high-frequency pulse into direct current (DC) in a current-conversion circuit by a matching transmitter set between antennae and oscillators of a high-frequency pulse. In addition, the conductivity sensor was temperature corrected.
- However, this information does not provide irrigation strategy in moisture sensor controlled irrigation system for commercial production. Therefore, the purpose of this study was to examine a technique for scheduling irrigation using the FDR sensor aimed at avoiding effluent from an open hydroponic system with coir substrate containing different percentages of chips and dust, two-story coir substrates with different percentages of chips in the lower layer and dust in the upper layer, and commercial rockwool substrate. The key objectives were to undertake preliminary measurements of irrigation volumes, volumetric water content and electrical conductivity (EC) in the substrate, growth and fruit yield of tomato, and water use efficiency resulting from variation in chip content as an initial experiment.
대상 데이터
- This experiment was undertaken in a heated polyethylene film greenhouse at KonKuk University, Chungju,Chungcheongbuk-do, located at latitude 3°49'N and longitude 127°08'E.
- Tomato seed (‘Starbuck F1’, De RuiterSeeds®.) was sown on February 1, 2012, and four tomatoseedlings were transplanted on March 16, 2012, in each commercial coir slab (100 × 20 × 10 cm, chip : dust (v/v) =0 : 100%, 30 : 70%, 50 : 50%, or 70 : 30%, Sivanthi Joe Coirs, Tamil Nadu, India), in each two-story coir slab with different percentages of chips in the lower layer and dust in the upper layer (chip : dust (v/v) = 15 : 85%, 25 : 75%, or 35 : 65%), or in each rockwool slab (UR Co. Ltd., Korea) as a control with 1.2 m between rows and 0.33 m between plants.
데이터처리
- Data were subjected to analysis of variance (ANOVA) with SAS 9.2 (SAS Institute, Cary, North Carolina, USA). The experiment was set up using a randomized complete block design for four replications.
- Mean separation of measurement variables used Duncan’s Multiple Range Test(DMRT) at the 5% level.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.