HORTICULTURE 



I461 



be worked into the soil before planting. A mulch of manure was also 

 given to the spring crop of tomatoes. 



Dry- plot. During the time between seasons in the summer this 

 plot remained bare and unwatered. Before the autumn crops were plan- 

 ted it received fresh manure which was worked into the soil. The spring 

 crop of tomatoes also received a mulch of manure. 



On the plots thus treated two crops of tomatoes were grown each 

 year, one in autumn and one in spring. The figures given in Table I sum 

 up the results obtained from 1908 to 1914. 



Table I. — Tomato Crop ; Average Weight per Plant. 



In addition lettuces were grown from 1911 to 1913, and Table II gives 

 the results obtained during this period, as a general average of spring and 

 autumn crops. 



Table II. — Lettuce Crop ; Average Weight per Plant. 



Plot 



Spring and Autumn Crops 

 1911-1913 



Soil cultivated and taanured for i o years 



New soil 



Straw mulch. 



Manure mulch 



Dry plot 



4.40 



3-55 

 2.98 

 4.18 

 4.11 



From the results of these experiments and from others carried out with 

 cucumbers, the following conclusions are drawn : 



1. The common greenliouse crops of Ohio, tomato, cucumber and 

 lettuce, require different soil conditions for maximum yields. 



2. lycttuce can be grown continuously with safet}' on unrenewed 

 soil with application of manure. 



3. Tomatoes and cucumbers are sensitive to conditions found in 



