134 EXPERIMENT STATION RECORD. 



Mean deviations from the mean yields on plats of different areas. 



Thif? and other tables indicate that notwithstanding the apparently uniform 

 nature of the soil, the yields from the single or 1 sazhen plats show considerable 

 fluctuations, the mean yield from a plat being 2.03 kg. and the mean deviation 

 +0.1489 kg., or 7.336 per cent. If the small plats are formed into larger plats 

 the relative deviations decrease with the increase of the plat area. The greater 

 the numbei" of parallel plats the more accurate are the results. The number of 

 parallel plats remaining the same, the larger the plats the more accurate are 

 the results. The total area of the field remaining the same, .the larger the 

 number of the plats the smaller the deviation. Accordingly, the same degree of 

 accuracy of experimental results may be obtained on a larger number of 

 smaller plats of a smaller total area as on a smaller number of larger plats of a 

 larger total area. 



[Field crop yields and methods of production], A. J. McGuire {Minnesota 

 8ta. Bui. 116, PI). 385-391, 3<JD-.',08) .—The yields and methods of production of 

 field crops at the northeast substation in 11)08 are reported and discussed with 

 special reference to conditions in northeastern Minnesota. 



[Experim.ents with fi^eld crops at Coimbatore], C. J. W. Shkpperson (Rpt. 

 Dept. Agr., Madras, 1908-9, pp. 22-31). — Cotton planted broadcast produced a 

 greater yield and profit than that which was drilled or that which was deeply 

 plowed. Cotton and millet as a mixed crop produced a greater profit than cotton 

 and horsegram or cotton and coriander. 



The fertilization of ragi with cattle manure, ground nuts, white castor, black 

 castor, superphosphate, ammonium sulphate, and nitrate of soda, singly or in 

 combination, produced very little effect. Bed transplantation under irrigation 

 had an advantage over ridge planting. When thinly sown 1 lb. of seed supplied 

 enough plants to transplant an acre, but when sown at the usual rates 4 lbs. 

 were required and the yields of grain were 1,201 and 931 lbs. per acre, 

 respectively. 



Results of experiments with wheat, indigo {Tephrosia purpurea), and 

 errukam {Calitropis (jigantca) as green manures for paddy are presented in 

 tabular form. These green manures produced results inferior to those of 

 white castor and black castor, but superior to those of bones with or without 

 ammonium sulphate or nitrate of soda. 



Variety and spacing tests with rice are reported. Plants spaced the distance 

 of the closed fist apart produced the maximum yield of 1908-9, but this rate 

 was excelled by single, double, and treble plantings 9 in. apart in 1907-8. 



Results of experiments with , corn with and without irrigation and when 

 planted on ridges, on the plat, and in beds are given, as well as notes on 

 sugar cane, cowpeas, Kafir corn, and other crops. 



