農作業研究
Online ISSN : 1883-2261
Print ISSN : 0389-1763
ISSN-L : 0389-1763
37 巻, 4 号
選択された号の論文の7件中1~7を表示しています
  • 西村 融典, 山浦 浩二, 十川 和士
    2002 年 37 巻 4 号 p. 205-214
    発行日: 2002/12/18
    公開日: 2010/02/09
    ジャーナル フリー
    The semi-mounted type onion picker with forklift was developed in order to improve the onion harvesting system on a small scale paddy field.
    1. This machine picks up the onions, made in windrow on top of each row, and puts them into small containers (20kg capacity), and them trans-fers 300kg onions together to a truck. The dimensions of this picker was 2.0m length, 1.5m width, 1.7m height and 0.7m working width.
    2. The operation of the system using this machine needs three workers, that resulted in high field capacity of 4.1h/10a and light labor requirement for harvest work.
  • 細見 彰洋
    2002 年 37 巻 4 号 p. 215-221
    発行日: 2002/12/18
    公開日: 2010/02/09
    ジャーナル フリー
    A new method of Gibberellin (GA3) treatment was developed to avoid GA-induced hardening of the rachis in ‘Pione’ grapes (Vitis vinifera L.×Vitis labrusca L.).
    GA solution including starch or gelatin, to increase its viscosity, was spread on the surfaces of clusters using the palm of the human hand. The solution with starch contained 39ppm GA (treatment at bloom) and 78ppm GA (postbloom treatment). The solution with foamed gelatin contained 139ppm GA (treatment at bloom) and 156ppm GA (postbloom treatment). The effects on berries of this GA treatment (spreading) were compared with conventional GA dipping and with untreated specimens.
    GA spreading settled more berries on the clusters than GA dipping. The size, color, seedless rate, Brix and acid in mature berries treated by GA spreading were all similar to values for GA dipping.
    Rachises of berries treated by GA spreading were as slender and as flexible as those of untreated berries, and were similar in length to those treated by GA dipping. GA spreading could prevent the hardening of the rachis, but not the postharvest dropping of berries. The postharvest dropping of berries treated with GA could be caused by weak berry adhesion rather than by the hardness of the rachis.
  • 藤原 隆広, 吉岡 宏, 熊倉 裕史, 佐藤 文生, 井上 昭司
    2002 年 37 巻 4 号 p. 223-229
    発行日: 2002/12/18
    公開日: 2010/02/09
    ジャーナル フリー
    To improve uniformity of growth of cabbage plug seedlings, we investigated the effects of seed size and sowing depth on the growth of seedlings.
    1) Cabbage seeds divided by size (2-7mg by every 1mg) were sowed in plug tray at 10mm depth, and germination rate and shoot growth at cotyledon expanded stage were investigated.
    (a) The germination rate of 100% did not obtained in each size. (b) Growth of shoot differed depending on the seed size. (c) The difference in seed size did not influence the uniformity of the shoot growth. The result of (b) and (c) clearly shows that uneven of the shoot growth in a tray is caused by not seed size but coexistence of different size of seeds.
    2) We sowed cabbage seeds (5.0-5.9mg) into the sowing hole set in three depth of 5mm, 10mm, and 20mm, and growth of seedlings at cotyledon expanded stage were investigated. (a) The ratio of defective seedlings was decreased when sowed more than 10mm depth. (b) Growth of the shoot was inferior when sowed at 5mm or 20mm depth compared to 10mm because of the smaller root growth in the former, and because of the delay of emergence and increased dry matter partitioning to hypocotyl in the latter. These results indicates that the desirable sowing depth to be 10mm in plug nursery system in cabbage.
    In concluding, we should note that it is possible to get the uniform growth of cabbage seedlings in plug nursery system by the seed selection of high accuracy of about 1mg and then sowing in the depth of 10mm.
  • 堀元 栄枝, 荒木 肇, 石本 光明, 伊藤 道秋, 藤井 義晴
    2002 年 37 巻 4 号 p. 231-240
    発行日: 2002/12/18
    公開日: 2010/02/09
    ジャーナル フリー
    ヘアリーベッチ(Vicia villosa Roth)を用いたトマト生産システムの確立のため,トマト(Lycopersicon esculentum Mill.)の生長および収量におよぼすヘアリーベッチのすき込みやマルチ(不耕起)の効果と元肥窒素肥料(0~120kg/ha)の効果を調査した.試験は1997年と1999年に行い,対照としてヘアリーベッチを前作せずに耕起した慣行栽培圃場を用いた.トマト葉柄汁液中の硝酸イオン濃度は定植後42日後に最も高くなった.慣行栽培圃場では定植後56日には1,000ppm以下に低下したが,ヘアリーベッチすき込みおよびマルチ栽培圃場では2,000ppm以上を維持していた.トマトの生育指数(GI)はヘアリーベッチすき込みおよびマルチ栽培圃場で慣行栽培圃場より高くなり,窒素施肥量によるGIの差異は認められず,窒素無肥料でも収穫開始時に必要とされるGIに到達した.トマト生育初期の葉柄汁液中の硝酸イオン濃度およびGIはヘアリーベッチすき込み栽培圃場よりマルチ栽培圃場で高くなった.ヘアリーベッチすき込みおよびマルチ栽培圃場のトマト収量は両年とも慣行栽培圃場より増加し,特にマルチ圃場では0~60kg/haの窒素施用でも120kg/ha窒素施用の慣行栽培圃場と同等の収量を示した.増収は収穫初期から中期に認められた.慣行栽培圃場でのトマト収量は施用窒素量に応じて増加したが,すき込みおよびマルチ栽培圃場とも窒素肥料によるトマトの増収は認められなかった.以上から,トマト生産において前作したヘアリーベッチをすき込みあるいはマルチとして利用すると,慣行栽培法と比べて葉柄汁液中の硝酸イオン濃度を高めてトマトの生育促進と増収に結びつき,特にマルチ栽培圃場で顕著であった.ヘアリーベッチを前作してすき込みやマルチとする生産体系により窒素肥料の減少が可能となるであろう.
  • 松村 昭治
    2002 年 37 巻 4 号 p. 241-249
    発行日: 2002/12/18
    公開日: 2010/02/09
    ジャーナル フリー
  • 二酸化炭素とメタンの人為的発生と削減
    坂井 直樹
    2002 年 37 巻 4 号 p. 251-258
    発行日: 2002/12/18
    公開日: 2010/02/09
    ジャーナル フリー
  • 機能的な分散分析表の形
    執行 盛之
    2002 年 37 巻 4 号 p. 259-274
    発行日: 2002/12/18
    公開日: 2010/02/09
    ジャーナル フリー
feedback
Top