報告書番号

U88076

タイトル（和文）

ホウレンソウの高能率養液栽培に関する基礎的研究－発芽，栽植密度，培養液濃度－

タイトル（英文）

STUDY ON THE SPINACH CULTIVATION BY SOLUTIONCULTURE. --GERMINATION,PLANTING DENSITY,CONCENTRATION OF SOLUTION--

概要 （図表や脚注は「報告書全文」に掲載しております）

本研究はホウレンソウの養液栽培における生産性向上を図る上で課題となる１）発芽率の向上，２）適切な栽植密度，３）培養液濃度について検討したものである。・ホウレンソウの発芽は，発芽床の水分含量が多い条件下では著しく抑制された。・浸漬条件下で空気の吹き込みおよび水の交換を行うことにより発芽率の向上とともに発芽した苗の枯死も防ぐことができた。・栽植密度が畝間７ｃｍにおいて，株間４ｃｍで充分な生育・収量が得られた。・標準濃度の１／２濃度区でも充分な生育が認められたが，標準濃度区，２倍濃度区に比べ生育は抑えられるとともに，乾物率，クロロフィル含量ともに低かった。・１／２濃度区では強日射量条件下（１ｃａｌ／平方ｃｍ・ｍｉｎ）で葉焼けが生じたが，標準濃度区，２倍濃度区ではこの現象は認められなかった。

概要 （英文）

THIS STUDY WAS CARRIED OUT TO IMPROVE THE SPINACH CULTIVATION BY SOLUTION CULTURE. THE RESULTS WERE AS FOLLOWS; 1.GERMINATION TEST. GERMINATION OF SPINACH SEEDS WAS INHIBITED UNDER EXCESS MOISTURE CONDITIONS. WHEN A URETHANE SHEET WAS USED FOR THE GERMINATION SUBSTRATUM,IT WAS VERY DIFFICULT TO CONTROL THE MOISTURE CONTENT IN THE SHEET.THEREFORE,GERMINATION OF SPINACH SEEDS AND GROWTH OF EARLY STAGE SEEDLINGS WERE INHIBITED.BUT,WHEN THE GERMINATION SUBSTRATUM WAS SET IN THE WATER,AND AIR WAS BLOWN IN THE WATER,GERMINATION OF APINACH SEEDS WAS ACCELERATED EVEN IN THE WATER,AND MORTARITY RATE OF EARLY STAGESEEDLINGS WAS VERY LOW. 2.OPTIMUM PLANTING DENSITY. SIX LEVELS OF PLANTING DENSITY(INTERROW SPACE;7CM,INTERHIL SPACE;1CM,2CM,4CM,6CM,8CM,10CM) WERE SET IN THIS STUDY. THE OPTIMUM INTERHILL SPACE TO PRODUCE THE PLANT,WHICH WAS HIGHLY QUOTED ON THE MARKET,WAS MORE THAN 4CM. 3.OPTIMUM CONCENTRATION OF NUTRIENT SOLUTION. FOUR LEVELS OF CONCENTRATION OF NUTRIENT SOLUTION(0.227 0.278MS/CM,1.281 1.394MS/CM,2.41 2.45MS/CM,4.51 4.56MS/CM)WERE SET IN THIS STUDY. SPINACH PLANTS GREW VERY WELL UNDER THECONDITION OF THREE LEVELS WITHOUT 0.227 0.278MS/CM. IN THESE THREE LEVELS,1.281 1.394MS/CM WAS ABOUT A HALF CONCENTRATION OF STANDARD.IN THISLEVEL,PERCENTAGE OF DRY MATTER AND CHLOROPHYLL CONTENT WERE LOWER THANTHESE OF THE OTHER TWO LEVELS.AND,THE PLANTS WHICH GREW IN THIS LEVEL,WERE SENSITIVE TO HIGH SOLAR RADIATION,AND LEAF BURN WAS INDUCED.

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