480 Agricuitur. — Horticultur. — Forstbotanik. 



von Solanum Melongena als Salat verspiesen. Nasturtium officinale 

 allgemein eingeschleppt. Wurzeln von Manihot und die Rhizome von 

 Colocasia vera, treten an die Stelle von Kartoffeln. 



Statt Papier werden Blätter zum Einwickeln der Waren verwendet, 

 so besonders von Hibiscus similis, Bananen, Colocasien ; als Zigaretten- 

 papier die Blattfiedern von Arenga. — Dunkelgrüner Gele von Blättern 

 von Cyclea peltata, als Leckerei und Heilmittel; auch an allerlei Arznei- 

 mittel ist der Markt reich. Verf. beschreibt zum Schluss noch ein 

 malayisches Mittagessen mit vorwiegend vegetabilischen Speisen. 



M. Rikli. 



Watts, F., Manurial Experiments with Sugar-cane 

 in the Leeward Islands, 1902 — 03. (Imperial Depart- 

 ment of Agriculture for the West Indies, Pamphlet Series. 

 1904. No. 30. p. 1—78.) 



The investigations summarized in this pamphlet are a portion of 

 the experimental work on the manuring of the sugar cane carried on 

 continuously for several years in the Lee ward Islands, in order to 

 attempt to solve the immediately pressing questions confronting the 

 planters. 



As the general result of a series of 36 experiments each repeated 

 many times on various estates, the author concludes that „plant" canes 

 when planted in land properly tilled and manured with about 20 tons of 

 pen manure to the acre require no artificial manure. When the soil is 

 in good condition but pen manure has not been added, artificial manures 

 may prove remunerative, l l /a to 2 cwt. of sulphate of ammonia or 2 to 

 2 3 /4 cwt. of nitrate of soda being recommended, in one application. 

 A small additional profit will probably follow the use of 3 /a to 1 cwt. of 

 sulphate of potash together with phosphate. 



For „ratoon" canes nitrogen is very necessary, and must be used in 

 a rapidly acting form to obtain good ratoon crops. 



Dividing the nitrogen into two doses is stated to be detrimental. 

 The Suggestion is put forward that the reason of the benefit derived 

 from adding the manures early, and in a quick-acting form lies in the 

 fact that there is a considerable drain on the soil at first whilst the 

 foliage is being developed, but that in monocotyledons^ such as the cane, 

 the foliage soon reaches its maximum, after which new leaves are formed 

 and old ones decay at about equal rates, and that the old leaves pass 

 on their nitrogen, potash etc. to the growing point necessitating only 

 slight additional demands on the soil. In support of this view analyses 

 are given of dry and green leaves. 



In an appendix it is pointed out that it is at present customary to 

 present the results of sugar-cane experiments in terms of pounds of 

 sucrose obtained per acre, a mode necessitating chemical analysis and 

 tedious calculations. Careful comparison of a large series of experiments 

 extending over several years show that there is not any striking Variation 

 in the pounds of sucrose per ton of cane co-related with any Variation 

 in the manures used. The manures exert their influence in altering the 

 weight of cane per acre, rather than the weight of sucrose to the ton of 

 cane. Accordingly for the planter the same inferences can be more 

 simply and easily expressed by merely giving the results in tons of 

 cane per acre, a matter of considerable importance both to the planter 

 and scientific investigator. W. G. Freeman. 



Ausgegeben: 8. November 1904. 



Commissions -Verlag: E. J. Brill in Leiden (Hollard). 

 Druck von Gebrüder Gotthelft, Kgl. Hofbuchdrucker in Cassel. 



