This report is made based upon the investigations of the castor cultivation in Thailand and the analytical experiments of materials taken during 20 th, September, 1961 and Junuary, 1962 and their summaries are as follows;
1. It is desirable to make the plan of increasing production because the demand of the castor seed oil in the world seems to increase in days to come.
2. It is desirable to take up the castor cultivation for the economy of farmers because it seems to have no disadvantage compared with the other crops which are cultivated in the same period.
3. It can be developed advantageously in the international market because the cost of the castor seed produced in Thailand is cheaper than the other countries and conditions of the productions are not bad
4. It is desirable to form the main production area in the following where the increased plan can be made. As the main production area, Nakornrajsima area as the center of the Northeastern part, and areas of Sarabusi, Supanburi, Lopburi and Chainat, and Sukhothai and Kanchanaburi districts of the Central plain are the areas for forming the main production areas.
5. By different period of production, there is much difference in moisture content, oil content and acid value in the castor seed produced in Thailand and there are many cases of the qualitative change during exporting. So it is desirable to improve positively to correct above by adopting non-dehiscence varieties, moving the cultivation period, adopting of the topping method, excluding the immatured seed, etc.
6. At present, the adoptation of Kao Dam species is desirable but it seems much desirable to breed a several varieties considering ecological character and also it is desirable to find out the most adequate variety of each district by a comparative study.
7. Adoptation of F₁ castor hybrids at present seems to be difficult but if the experiment equipment and the original seed farm are completely established, the increase porduction by F₁ castor hybrids can be expected in the future.
8. It is not desirable to adopt the American varieties when many conditions of Thaliand are considered. It is desirable to adopt the excellent varieties which are breeded from the indigenous varieties.
9. It is necessary to guide the topping method positively for decreasing the cost of harveslrng by increasing production and making the harvest easy.
10. It is desirable to encourage the cultivation of the intercropping for distributing the danger because of exporting crop and making the increase profit per hectare.
11. It is desirable to cultivate as the annual crop because the second year culture up decreases the yield, intercropping becomes difficulty and much harvesting expenses are required because of higher plant height.
12. The chemical fertilizer can be considered to supplement the insufficient supply of organic matters by intercropping of the leguminous crop.
13. It must be avoided to harvest the immatured capsule.
14. For control of the injurious insects, the insecticide such as Denapon can be used, but at the other hand, it is desirable to study the effective use of the natural enemy.
15. Collecting and inspecting agencies by the nation should be established and it is desirable to have an institution whick carry out to buy with an adequate price.
16. It is desirable to substantiate the experimental research institute and to promote to train technicians for the future development. For the time being, it is also desirable to consolidate Banmaisamrong Agricultural Experiment Station.
17. It is desirable to carry out to increase the production to 120, 000 tons by 5 year plan in estimating the increasing demand of the world and advantage of the castor seed prrduced in Thailand in the international market, but, on the other hand, the increasing production cannot be developed advantageously unless improvement of the quality is accompanied,

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濠州のパイン栽培の始まりは1838年にドイツ人宣教師によりインドからBrisbaneに導入されたもので, 約120年の歴史をもつている.現在主産地はQueensland州で年産6～9万t, その600は缶詰にして輸出される.またNew South Wales州がこれに次いでおる.主要栽培品種はSmooth Cayenne種, 栽培は傾斜地に多く行なわれ, 畦は等高線に沿う階段状として, 植付本数はエーカー当たり1.4～2.0万本である.基肥は植付前に施され, 追肥として尿素の葉面散布が規則的に行なわれる.開花から成熟まで約6ヵ月を要し, 収穫は主として人力で行なわれ, 収量はエーカー当り25～40tである.最近の技術改良上注目すべき点は除草剤の使用と開花・果実の成熟促進の目的で行なう植物ホルモソのαナフタレン醋酸の散布である.なお濠州のパイン栽培では労力の節約が極めて重要であるが, この点小規模経営の多いことおよび主として傾斜地栽培が行なわれることのため機械化による労力節約の余地が少ない.技術改良上の諸問題はMaroochy Horicultual Reserch Stationにおいて研究されておる. (編集部)
ブイジー諸島: 太平洋諸島には小型のPolynesian ratが広範囲に分布するが, ブイジーでもこの鼠による被害が大きく, 最も被害の多い作物はココ椰子で, 被害程度についてTALOR氏は結実したものの6.85%が鼠害を受けるとし, またPAINE氏は結実したものの28.7%0が鼠害を受けて落果する場合があるとした.被害を受け易い時期は未成熟果と乾燥中のコブラである.駆除には毒殺とワナによる捕殺が行なわれてある.
マラヤ: 同地域の被害程度についてJACK氏はPerakのKrian地方での調査により生育中の稲の約6%0が被害を受けたと報じておる.マラヤに棲息する鼠は60以上の亜種に及ぶが, 作物に被害を与えるのはその中の小数の亜種である.中でもRice field ratが大害をなす.その他, 油椰子・ゴムの農園ではWood rat, 建物の中の貯蔵物にはMalay house rat, 港の倉庫の中では普通のBrown rat, 畑と建物内の商方でBurmese little rat, また稲を喰害する体長10吋に達する大鼠 (Bandicoot) が知られておる.駆除法は毒殺, ワナまたはモチによる捕殺, 鼠穴の燻煙法, 収穫直後の畑を犬をつれて多人数にて追出して捕殺する方法等がとられる.
毒殺法では従来の砒素・燐などを使う方法は廃れ, 燐酸亜鉛の2.5%0 (餌40に対し1の割合) を使い, また毒の使用の際にも鼠の毒に対する警戒心を少なくする目的で最初無毒の餌を1～2回与え, その後に毒餌を置くという方法が多く行なわれておる.1950年以来駆除用の毒の研究が進められ“Warfarin”という薬剤が上記燐酸亜鉛より一層有効で, 例えばShip ratの場合には餌に対してわずか0.025%与えても効果が著しいことが明かになつた. (編集部)

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