PROMISING GEEEN-MANUEE CEOPS. 



27 



Table I.— Growth of plants and weight per acre of green-manure crops sown with irriga- 

 tion October 19, 1907, at Chico, Cal. 



Name. 



Black bitter vetch.... 



Black-purple vetch.. 



Woolly-podded vetch 



Hairy vetch 



Common vetch 



Lathyrus sativus 



Tangier pea 



Field pea 



Horse bean 



Weight of 

 green ma- 

 nure, March 

 28, 1908. 



Pounds. 

 32,056 

 23, 236 

 24,042 

 15,609 

 18, 876 

 11,616 

 7,623 

 19, 239 

 13,794 

 15,944 

 10,890 



Table II —Growth of plants and iveight per acre of green-manure crops sown with irriga- 

 tion October 5, 1908, at Chico, Cal. 



Name. 



Black-purple vetch.. 



Woolly-podded vetch 



Black bitter vetch... 



Horse bean 



Fenugreek 



Tangier pea 



Bur clover 



Hairy vetch 



Common vetch 



Rate of 

 seeding. 



Pounds. 



f 62 



[ 45 



48 



f 76 



[ 49 



149 



29 



72 



21 



31 



33 



Height of 



plants, 



March 15, 



1909. 



Inches. 



32-36 



36-40 



30-36 



20-22 



20-22 



30-36 



16 



17 



14-16 



8-15 



10-18 



dry mat 



ter, March 



16, 1909. 



Weight of Weight of 



Pounds. 

 40, 565 

 14,374 

 25, 047 

 27,660 

 14,374 

 21,130 

 13,721 

 12, 840 

 11,980 

 5,880 

 2,831 



dry mat 

 ter, April 

 10, 1909. 



Pounds. 

 3, 075 

 2,321 

 2,933 

 3,776 

 2, 130 

 2,634 

 1,783 

 1,646 

 735 

 871 



Propor- 

 tion of 

 dry to 

 green 

 matter. 



Per cent. 



9.0 

 1G.8 

 11.7 

 13.6 

 14.8 

 12.4 

 12.9 

 12.8 



6.1 

 14.8 



Table III.— Weight of green-manure crops growing in orange orchards in California. 



Name. 



Tangier pea 



Common vetch 



Malva rotundifolia. 



Bur clover 



Field pea 



Fenugreek 



Common vetch .... 



Place. 



Redlands 



....do 



....do 



do 



....do 



Santa Paula. 

 do 



Weight of 

 green mat- 

 ter per acre. 



Pounds. 

 29,093 

 13, 578 

 19,800 

 16,347 

 7.260 

 11,745 

 19, 140 



Weight of 

 green mat- 

 ter per 0.718 

 acre.o 



Pounds. 



20,888 

 9,749 



14,216 



11,737 

 5,212 

 8,432 



13,742 



a This equals the part of an acre usually covered by a green-manure crop in an orchard. 



PROMISING GREEN-MANURE CROPS. 



As shown by Tables I and II, giving comparative yields, there 

 are several plants very promising for green-manure purposes as com- 

 pared with common vetch and field peas. The claim of superiority 

 for these plants is largely due to their ability to make more growth 



ivto 



