I. Fertilizer Applications for NC and MS 1 = All 2 = Control 3 = All less N 4 = all less P 5 = all less N & P 6 = 1 + sugar (NC only) 7 = 2 + sugar (NC only) 8 = 3 + sugar (NC only) N A P F A P 1 T P u n r a n r 9 r l t n o c n o 8 e o r d t u d 6 a t i g u o a u t s e o c r l t m n a t e t l n t (g/m2/yr) (g/plt/yr) (g/plt/trt) Group 1: P 4.4 KH2PO4 .2276 231.98 77.32 1,3,6,8 [super P 250.24] Group 2: N 10.0 NH4NO3 .350 342.86 114.3 1,4,6 Ca 3.0 CaCl2 .361 99.72 33.24 1,3,4,5,6,8 B 0.02 Soluboa .205 1.171 0.39 1,3,4,5,6,8 [Na2B4O7.10H2O .1135 2.114 0.70] Group 3: K 5.55 KCl .524 127.1 42.37 4,5 [KH2PO4 .287 232.1 (in P)] Mg 2.5 MgSO4 .202 148.5 49.50 1,3,4,5,6,8 Mn 0.5 MnSO4.H2O .325 18.46 6.15 1,3,4,5,6,8 Zn 0.5 ZnSO4.7H2O .227 26.43 8.81 1,3,4,5,6,8 Cu 0.2 CuSO4.5H2O .255 9.41 3.14 1,3,4,5,6,8 Fe 0.2 FeSO4.7H2O .201 11.94 3.98 1,3,4,5,6,8 Mo 0.005 Na2MoO4.2H2O .397 0.151 0.050 1,3,4,5,6,8 Group 4: Sugar 600 Sugar 1.0 7200. 2400. 6,7,8 (S added as component of salts) Granulated sugar divided into 3 equal bags. Each bag applied evenly over a 2 x 2 m square of the plot. Fertilizer in groups 1-3 added in aqueous form with watering can. Used 6 liters of water. Walked a pattern starting along the inner half of the inner 50cm and then returning along the outside half of the inner 50cm. Water is then applied in the same fashion on the other side of the center line. The process continues with down and back on each of the outside 50 cm buffer strips for a total of 4 down and 4 back walks. Exceptions to the general rules above: 1985: This year the annual total for series 1-3 was applied in 2 rather than 3 treatments, so the size of the treatments were increased accordingly. That is, the amounts were 1.5x the amounts shown for 1986. P was added in 2 forms, 1/3 in soluble KP salt form and2/3 in slow release superphosphate form. The 1986 shift to all soluble P necessitated a shift in the level of K addition. In 1985 the annual goal was 4.2g K, but more K than this had to be added in 1986 to the P addition plots to reach the P objective, so the annual goal was increased to 5.55g which is consistent with the total P addition. 1986: For the second addition we tried B in Na2B4O7 form, but this was discontinued because of solubility problems. 1987: Because soil analyses indicated a Zn build up, we deleted Zn for the first addition of the year. We are giving thought to omitting the final fertilization of the year (except Sugar) so as to reduce by 1/3 the level of fertilization. Reduce by 1/3. Same in 1988, 1989. 1988: Noticed nitrate burn on plants at NC when very hot and little dew. Decided to omit the second nitrogen application from MS to avoid this problem. 1989: Continued with 2/3 as in 87 and 88, except that summer N applications skipped in both NC and MS to avoid burn. II. Fertilization in Holland 1 = Control 2 = Complete 3 = complete - N 4 = complete - P 5 = complete - N,P Element Product Annual addition Application of product (g/m2) (-group) N NH4NO3 28.6 aq - 1 P superphosp 50. powder (20% P2O5) K KCl 8 aq - 2 Ca CaCl 8.3 aq - 2 S (in other products) Mg MgSO4.7H2O 25.34 aq - 3 Zn ZnSO4.7H2O 2.2 aq - 3 Mn MnSO4.H2O 1.5 aq - 3 Cu CuSO4.5H2O 0.8 aq - 3 Fe FeSO4.7H2O 1.0 aq - 3 Mo NaMoO4.2H2O 0.01 aq - 3 B Na2B4O7.10H2O 0.70 aq - 4 Added 6 liters water for each solution. Exceptions to general rules: 1985: I believe two additions of 1/2 ann total each used. (??) 1986: Ca, Mg, Zn no longer applied because abundant in soil. P added in aqueous form now? Elsewise all the same as in 1985. 1987: (Projection is to use same fertilization as in 1986.) III. Fertilization in Sweden 1 = control 2 = complete 3 = complete - N 4 = complete - P 5 = complete - N & P 6 = water addition only (1986 and subsequent) Element Product Application per Plots treatment (g/plt) Solution 1 P K2PO4 77.3 2,3 K KCl 42.3 4,5 Solution 2 N NH4NO3 114.3 2,4 Ca CaCl2 33.23 2,3,4,5 Mg MgSO4.7H2O 101.44 2,3,4,5 Solution 3 all = 2,3,4,5 B Na2B4O7 0.373 Cu CuSO4.5H2O 3.15 Zn ZnSO4.7H2O 8.792 Mn MnSO4.H2O 6.16 Fe FeSO4.7H2O 3.980 Mo Na2MoO4.2H2O 0.50 EDTA 6.542 Fertilizers added as 3 solutions, using 5 liters of water per addition. Solution 1 = P and KP; Solution 2 = N, Mg, Ca; Solution 3 = B, Cu, Zn, Mn, Fe, Mo (& EDTA) Solution 3 was prepared by dissolving micromutrients for both applications in distilled water. 55 ml 1M HCl was added to avoid flocking. Together this gave 10 l, or 208 ml/ application to be distributed with 5 liters of water Notes: No fertilization in 1985 so as to have better baseline data. Total amounts 2/3 annual addition of other sites because of lower annual production.