• Plant Disease and Agriculture
• /
• v.2 no.2
• /
• pp.23-29
• /
• 1996

최근에 농업기술의 발달로 작물의 재배환경과 재배기술 또한 날로 개선되어 가고 있으나 농촌인력의 부족과 재배자의 고령화로 인한 토양 비배 관리의 소홀, 화학 비료의 과다 및 편중 사용, 토양산도 변화에 따른 작물의 영양 흡수 불균형으로 인한 각종 생리적 장해의 발생과 하우스 재배면적의 증가로 인한 연작장해의 발생이 심각한 문제로 대두되고 있다. 본 강좌에서는 $\mathbb{\ulcorner}$영양생리 장해의 발생현황과 발생조건$\mathbb{\lrcorner}$과 $\mathbb{\ulcorner}$영양생리 장해의 진단$\mathbb{\lrcorner}$에 이어 작물 재배시에 발생하는 각종 $\mathbb{\ulcorner}$영양생리 장해의 대책$\mathbb{\lrcorner}$을 소개한다.

• Plant Disease and Agriculture
• /
• v.2 no.1
• /
• pp.50-60
• /
• 1996

최근에 농업기술의 발달로 작물의 재배환경과 재배기술 또한 날로 개선되어 가고 있으나 농촌 인력의 부족과 재배자의 고령화로 인한 토양 비배 관리의 소홀, 화학 비료의 과다 및 편중 사용, 토양 산도 변화에 따른 작물의 영양 흡수 불균형으로 인한 생리적 장해의 발생과 하우스 재배면적의 증가로 인한 연작장해의 발생이 심각한 문제로 대두되고 있다. 본 강좌에서는 지난 호의$\mathbb{\ulcorner}$영양생리 장해의 발생현황과 발생조건$\mathbb{\lrcorner}$에 이어 작물재배시에 발생하는 각종$\mathbb{\ulcorner}$영양생리 장해의 진단$\mathbb{\lrcorner}$방법을 소개한다.

• Journal of Bio-Environment Control
• /
• v.12 no.1
• /
• pp.30-37
• /
• 2003

An expert system was developed for the stress diagnosis of cucumber and tomato using FoxPro. The principle points in building the system were integration with Korean, effective processing of mass information, and easy access for non-experts such as farmers. The method of inferencing was forward chaining based on pattern matching. Knowledge base was expressed with IF∼THEN rules and was expressed in the form of tree. Also, the expert system was designed so that additions and modifications of all information could easily be performed on windows. The results tested by farmers with the developed system showed that the expert system was reliable for the practical use. It was expected the expert system could be directly applied to the stress diagnosis of other vegetable plants by modifying only data bases.

• Plant Disease and Agriculture
• /
• v.1 no.2
• /
• pp.31-36
• /
• 1995

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.31 no.1
• /
• pp.1-8
• /
• 1986

This study was investigated about influence of different cold water irrigation on the nutrient uptake of leaf blade, rachis branches and chaff. Longer duration of cold water irrigation increased total nitrogen content in leaf blade, branches and chaff but decreased the content of phosphate, potassium and silicate. The highest content of total nitrogen and phosphate showed at heading stage, that of potassium in leafblades and branches at heading but in chaff at maturing stage, and that of silicate at maturing stage. Inorganic element content in branches was similar with that in chaff in general. The excessive uptake of nitrogen by cold water irrigation caused decrease in the uptake phosphate, potassium and silicate showing clear nutrient disorder in the blades and chaff. High total nitrogen and low silicate in rice plants seemed to lead to degeneration of branches and spikelets, and to spikelet sterility. Degeneration and sterility appeared to be closely related to nutrient status of branches.

• Proceedings of the Korean Nutrition Society Conference
• /
• 2003.05a
• /
• pp.259.1-259.1
• /
• 2003

• Proceedings of the Korean Nutrition Society Conference
• /
• 2003.05a
• /
• pp.259.2-259.2
• /
• 2003

• Agrochemical news magazine
• /
• v.17 no.5 s.134
• /
• pp.30-32
• /
• 1996

• Horticultural Science & Technology
• /
• v.17 no.6
• /
• pp.737-741
• /
• 1999

We surveyed the physiological disorders of fruit vegetables grown in the greenhouse in Kyungbuk province in 1998. Greenhouses used for cultivation were mostly single or multi-span iron pipe houses covered with polyethylene film. Single span greenhouses were used for strawberry, oriental melon and watermelon. Fifty six percent of the surveyed farms was a mono-cropping system for oriental melon and tomato. There were greenhouses used for successive cultivation for 10 years or more for strawberry and oriental melon in Koryeong and Seongju. Varieties of fruit vegetables cultivated were diverse, especially in cucumber and watermelon. In strawberry, malformed fruits were observed most frequently in March and the small fruits at late harvest period. Leaf chlorosis, stunt plants and runner outbreak were also found during the growing season. In tomato, occurrence of malformed fruits was severe from March to May, and occurrence of cracked fruits and blossom- end rot was also severe in October and November. The self topping and abnormal stem in tomato were problem in hydroponic cultures in August and November, respectively. Malformed cucumber fruits, such as curved, club shaped, irregular shaped and narrow necked, occurred at late season. Umbrella-shaped leaf in cucumber in summer were caused by calcium deficiency. Most serious disorders were fermented and malformed fruits occurring from March to May in oriental melon, and cracked fruits occurring from April to May in watermelon. At late growing stage of melons the leaf chlorosis occurred with complex symptoms of leaf disease. Growers had little knowledge on physiological disorders, and also on diagnose and measures to cure the disorders. Most growers pointed out that poor soil environment and temperature management in the greenhouse as the main causes of physiological disorders.

• Applied Biological Chemistry
• /
• v.16 no.1
• /
• pp.18-30
• /
• 1973

The flag and lower leaves (4th or 5th) of rice plant from the field of NPK simple trial and from three low productive area were analyzed in order to find out certain diagnostic criteria of nutritional status at harvest. 1. Nutrient contents in the leaves from no fertilizer, minus nutrient and fertilizer plots revealed each criterion for induced deficiency (severe deficient case induced by other nutrients), deficiency (below the critical concentration), insufficiency (hidden hunger region), sufficiency (luxuary consumption stage) and excess (harmful or toxic level). 2. Nitrogen contents for the above five status was less than 1.0%, 1.0 to 1.2, 1.2 to 1.6, 1.6 to 1.9 and greater than 1.9, respectively. 3. It was less than 0.3%, 0.3 to 0.4, 0.4 to 0.55 and greater than 0.55 for phosphorus $(P_2O_5)$ but excess level was not clear. 4. It was below 0.5%, 0.5 to 0.9, 0.9 to 1.2, 1.2 to 1.4 and above 1.4 for potassium. 5. It was below 4%, 4 to 6, 6 to 11 and above 11 for silicate $(SiO_2)$ and no excess was appeared. 6. Potassium in flag leaf seemed to crow out nitrogen to ear resulting better growth of ear by the inhibition of overgrowth of flag leaf. 7. Phosphorus accelerated the transport of Mg, Si, Mn and K in this order from lower leaf to flag, and retarded that of Ca and N in this order at flowering while potassium accelerated in the order of Mn, and Ca, and retarded in the order of Mg, Si, P and N at milky stage. 8. Transport acceleration index (TAI) expressed as (F_2L_1-F_1L_2)\;100/F_1L_1$ where F and L stand for other nutrient cotents in flag and lower leaf and subscripts indicate the rate of a nutrient applied, appears to be suitable for the effect of the nutrient on the translocation of others. 9. The content of silicate $(SiO_2)$ in the flag was lower than that of lower leaf in the early season cultivation indicating hinderance in translocation or absorption. It was reverse in the normal season cultivation. 10. The infection rate of Helminthosporium frequently occurred in the potassium deficient field seemed to be related more to silicate and nitrogen content than potassium in the flag leaf. 11. Deficiency of a nutrient occured simultaniously with deficiency of a few other ones. 12. Nutritional disorder under the field condition seems mainly to be attributed to macronutrients and the role of micronutrient appears to be none or secondary.