Mitsubishi Gas Chemical Company, Inc.

Japan Hydrazine Co., Ltd.

Masakazu Furushima

Akinori Tanaka

Akinori Suzuki

Toshio Kajita

Takashi Suzuki

Mitsunori Oda

Taketo Maruyama

Shigeo Yoshinaka

Takashi Oritani

Shiro Hojo

Suong B Hyeon

Hideshi Tsuchiya

Tetsuo Takamatsu

Be H Suong

Kazuko Tamano

Suong Be Hyeon

Yuko Ebe

Noriko Tamano

Akiko Tamano

Yoshinori Sasaki

Yoshiaki Suzuki

Disclosed are novel adenine derivatives represented by the formula I and agriculturally acceptable acid addition salts thereof represented by the formula: ##STR1## wherein n is an integer of 2-4. Compositions for increasing yield of crops such as leguminous crops and gramineous crops which contain the above adenine derivatives or salts thereof as an active ingredient and methods for increasing yield of crops using these compositions are also disclosed.

Adenine derivatives and their use as agents for increasing yield of crops

A denine derivatives represented by the following formula: ##STR1## (wherein n is 1 or 2 and R and R' represent hydrogen or a methyl, ethyl, allyl, or propargyl group) and agriculturally acceptable acid addition salts thereof, which have cytokinin activity and besides, excellent rooting action, is applied to as plant growth regulators.

Adenine derivatives and their use as a plant growth regulator

This invention relates to use of compounds of the formula ##STR1## wherein R represents a C.sub.2-5 alkyl, C.sub.2-5 alkenyl or C.sub.2-5 alkynyl group, and X represents a hydrogen atom, a C.sub.2-8 alkylcarbonyl, carbamoyl, benzoyl, chloromethylcarbonyl or methoxycarbonyl group, or --PO.sub.3 H.sub.2, and Y represents a chlorine or bromine atom in promoting the growth of plants.

Plant growth promotion

Use of agriculturally acceptable salts of compounds of the following formula for promoting the growth of plants. ##STR1## wherein Hal represents a chlorine, bromine or iodine atom, X.sub.1 represents a hydrogen or chlorine atom, or a methyl, trifluoromethyl, nitro, methoxy or t-butyl group, and X.sub.2 represents a hydrogen atom, or both X.sub.1 and X.sub.2 represent a chlorine atom or a methyl group; and Y represents a hydrogen atom, or a C.sub.2-6 alkylcarbonyl, benzoyl, N-phenylcarbamoyl, N-3,4-dichlorophenylcarbamoyl, chloropropylcarbonyl, methoxycarbonyl, carbamoyl or methacryloyl group.

A method of increasing the harvest of a crop which comprises applying an effective amount of taurine to the crop or its seeds, and a composition therefor.

Method and composition for increasing harvests of crops

A plant growth regulating composition comprising as an active ingredient a combination of

Plant growth regulating composition

Tobacco yield is increased by spraying the plants after topping with an effective amount of an aqueous solution of the choline salt of maleic hydrazide.

Method for cultivation of tobacco plants

Growing community of inventors

Nagareyama, Japan

Masakazu Furushima