82 Bulletin 78 



Sudan grass very much resembles Johnson grass. It is an 

 annual plant, however, and has no rootstocks or underground 

 stems of any kind. Its yields are heavy and where it has been grown 

 as a crop it has given satisfactory results. The forage is rather 

 coarse though much relished by stock. It grows best during the 

 hot summer weather and is quite drought resistant. During the 

 summer of 1913, the yields of this plant at the Experiment vStation 

 Farm at Phoenix were at the rate of 8 tons per acre from two cut- 

 tings. It also produces heavy crops of seed. This is desirable since 

 the plant has to be sown annually. 



GUAVAS 



These tropical fruits are too sensitive to cold to be grown even 

 in the warmest parts of the vState. The common guava requires 

 some protection during our mildest winters. The strawberry 

 guava is somewhat hardier, but even this can not be grown satis- 

 factorily in the Salt and Lower Colorado River valleys. One should 

 not plant out fruits as tender as the guava unless he is well prepared 

 to care for them in winter. 



KAFIR AND EGYPTIAN CORN 



{See under Grain Sorghums) 



KOWLIANG 



{See under Grain Sorghums) 



LEMONS 



The climate of Arizona is not as well suited to the culture of 

 lemons as to oranges. The lemon is more tender, and to produce 

 continually, as a commercial crop should, requires an equable 

 climate near the coast. In a very few places in the Salt River and 

 Yuma valleys, where the mercury does not drop below 25° F., the 

 lemon can be grown for local consumption. In these valleys it will 

 not produce fruit in summer when the fruit is in greatest demand. 



Orchards should be heated when the temperature drops below 

 28° F. It is customary to start the heaters when the temperature 

 gets a degree or two below freezing if it gets this cold before 12 

 or 1 o'clock a. m. The mercury generally falls until about 4 a. ra. 

 on a still night. It is easier to keep the temperature of the trees at 



