- 8 - 



INFLUENCE OF LIME, SOURCE OF NITROGEN, AND/OR TIME OF APPLICATION 

 ON VEGETATIVE GROWTH AND FRUIT OF STURDY SPUR DELICIOUS 



W.J. Lord and John Baker 

 Department of Plant and Soil Sciences 



Fo 

 not the 

 apples . 

 core, i 

 verity 

 f rui t. 

 USDA, r 

 than do 

 it s h u 

 to nitr 

 soil p H 

 duce th 

 was sug 

 Researc 

 vi ewed. 

 di f fere 

 i n V e s t i 

 time of 

 Del i cio 

 Researc 



r yea 



sour 



How 



ntern 



if ca 



At 



eport 



es ni 



Id be 



ate b 



, app 



e pro 



geste 



h Tas 



The 



nee i 



gate 



N ap 

 us , a 

 h Cen 



rs , w 

 ce, w 

 ever, 

 al br 

 1 cium 

 ur Ne 

 ed th 

 trate 



appl 

 efore 

 lying 

 bl ems 

 d and 

 k For 



sour 

 n gro 

 the i 

 plica 

 n exp 

 ter . 



e told 



as the 



it is 



eakdow 



(Ca) 



w Engl 



at a mm 



N. H 



ied ea 



bloom 



Ca to 



assoc 



1 ater 



ce" (J 



ce of 



wth, h 



nf 1 uen 



t i n 



erimen 



grow 



most 



now 



n, st 



is pr 



and F 



on i urn 



e sug 



rly e 



. Fu 



the 



iated 



Stat 



une 1 



N, wh 



ardi n 



ce of 



n veg 



t was 



ers that 



importan 

 known tha 

 orage rot 

 e s e n t in 

 ruit Meet 



N reduce 

 gested th 

 nough so 

 rthermore 

 soil, and 



with low 

 e d in the 

 973) that 

 ether nit 

 ess, flow 



a high s 

 etative g 



ini tiate 



the am 



t cons 



t bitt 



s , etc 



high e 



ings i 



s both 



at if 



that a 



, Faus 



using 



c a 1 c i 



"Repo 



"N nu 



rate o 



e r i n g 



oi 1 pH 



rowth 



d in 1 



ount 

 iderat 

 e r pit 

 . are 

 nough 

 n 1972 



leaf 

 ammoni 

 1 1 amm 

 t sugg 



Ca sp 

 um. M 

 rt of 

 tri tio 

 r ammo 

 and f r 

 , 1 i m i 

 and f r 

 972 at 



f nitro 

 ion in 

 , cork 

 all red 

 concent 

 , Dr. M 

 and fru 

 um nitr 

 n i a is 

 ested c 

 rays to 

 ore rec 

 Northea 

 n shoul 

 nia, ma 

 u i t qua 

 ng, N s 

 u i t of 

 the Ho 



gen ap 

 grow in 

 spot, 

 u c e d i 

 ration 

 ikios 



it Ca 

 ate is 



conve 

 orrect 



hel p 

 ently, 

 St Fru 

 d be r 

 y make 

 1 i ty . '• 

 ource 

 Sturdy 

 r t i c u 1 



plied, 



g 



water- 



n se- 



s in 



Faust, 



more 

 used , 



rted 



ing 



re- 

 it 



it 



e- 

 a 

 To 



and 

 Spur 



tural 



The Delicious trees were planted in a soil having a pH of 6.5- 

 7.0 to a 2 foot depth. Two and one-half lbs of high Ca lime (40% 

 CaO; 1% MgO) were mixed in the soil in the planting holes for half 

 the trees. Ammonium nitrate, calcium nitrate or potassium nitrate 

 was then applied annually either 1 month before bloom or at bloom. 



Resul ts . Leaf analyses to date show that N source had no influence 

 on N and Ca content of leaves (Table 1). Although muriate of pot- 

 ash was applied under the trees receiving ammonium nitrate and cal- 

 cium nitrate in amounts to equal the potassium (K) content of potas- 

 sium nitrate, differences in K levels were apparent in 1973. Leaf 

 K was higher in the trees receiving ammonium nitrate plus muriate 

 of potash than in those receiving just potassium nitrate. 



Time of N application ( a month prior to bloom or at bloom) 

 did not influence the N, Ca, K or Mg levels in the leaves. Of in- 

 terest is that the economical procedure of incorporating high cal- 

 cium lime with the soil in the planting hole, significantly increased 

 Ca content in 1972 and 1973 although the differences were small: 

 1.08 and 0.79% Ca in leaves of trees from limed soil in 1972 and 

 1973, respectively, as compared to 0.96 and 0.74% Ca in leaves from 

 the trees in non-limed soil. 



