:iiicl surface 

 I'f tap-rooted 



.r will filter 

 L'rcolation of 



FERTILITY 



or remain to be eraporateil. TIm : 

 prepare the land by subdraiiiii;." . i 

 tillage, and by introducing at lr:i-i .. 

 plants in the rotation, that tlu- >ur 

 through the soil in a reasonaljlc t 

 rainwater through soils makes them more friable and 

 warmer in spring, aerates the land, promotes beneficial 

 biological and chemical changes, and brings to the soil 

 mpounds contained in the rainwater. 



fulness, is governed very largely by the water and mois- 

 ture conditions of the soil, and these, in turn, are largely 

 governed by the texture of the land and the amount of 

 humus which it contains. 



Legumes, used either as a harvest or cover-crop, pro- 

 mote fertility. A cover-crop of clovers planted August 

 1, and analyzed 64 days after planting, contained of 

 nitrogen, in roots and tops, per acre as follows: 



TofS Knots Total 



Lbs. Lbs. Lbs. 



Crimson clover 125 30 1.55 



Red clover 63 40 103 



Mammoth clover 67 78 145 



Clovers and other legumes may be tised to fix and store 

 up the uncombined nitrogen of the air and to digest and 

 make available the mineral constituents of the land, 

 thereby greatly increasing the fertility of the soil. 



Barn manures, when prn].erly cared for- and intelli- 

 gentl) applie 1 i I 1 ptable plant foo 1 



b It hum s as w 11 1 I 1 h ^h product vitj 



I uall may tern 1 b means of si 



per r t IKge leg 1 1 r ] i 



tl e I ures f tl t u 1 II t 



t t 1 a 1 e n nta n 1 M i 



t f o er 1 1 111 



FERTILIZ.VriON 



FERTILIZATION. The union of two sex- 

 male .-..11 and :i fcniale cell, to form anew one 

 of growiriu^ inT" a jdant. The term was former 

 to inclu'lf Tlif Ti-:mst"er of pollen to the stigni 

 Darwin - -o,, tl,.. l-'.-n ' 



but 



of Orchids ' 

 generally distinguished as Pol- 

 II the 



/-7 



// 



part is the spherical nucleus, 

 which occupies the center. 

 When the pollen grain is con- 

 veyed to the stigma (s. Fig. 

 815), the larger cell (^ Fig. 

 814), nourished by food it ab- 

 so I s from the st gma gi vs 

 forming a long tul e {} t F g 

 815) which traverses the i a 

 1 tr angular canal ( 1 ^ 

 Fg 81 ) that leals 1 wu tl 

 1 g St le to the o ai 1 



Pt-%^2 



the 



m, 



o a supeial undance of s 

 one or n ore of its usually 

 ful 11 gre lients as wate 



t g n s matter An e 



e f 1 trogen st ulates the 



r tl f t Ik an I t aw at 

 the \i e of gra n or n the 

 or ha I t te 1 t the for 

 mat on of oo 1 atl er tl n 

 to fr tf Ine s Tl e a 1 y 

 sho 1 1 1 e c e te 1 by 1 me 

 as noted al e the rplus 

 water leuo el 1 Ira nage celf"""'/ 

 the mtr gei ous natter re cell The 

 ducel by the [.roiucton of holy ne 

 such crops as are i ot harm nucle s 

 filh affected bj it s iper d ameter 

 ab in lance such as forage 



crop which are pr zed for their fol age rather tl ai f i 

 their seeds while tl e alkal n t maj somet i es 1 e over 

 come 1 5 deep tillage or rr gat on j p Roberts 



814 A pollen E a i 

 L 1 um Ph ladelph c 

 Befo e lea g thei 



ge pi 1 



1 ell tl e 

 Mag hed oUO 



