Plant and Soil Interfaces and Interactions Proceedings of the Intern
Forty years ago, when PLANT AND SOIL first appeared, Europe was still recovering from the devastating effects of World War II. During the war years, work in many centres of agricultural research had come to a virtual standstill. Buildings and equipment we
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Developments In Plant and Soil Sciences 1.
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1. Monteith and e. Webb, eds., Soil Water and Nitrogen in Mediterranean-type Environments. 1981. ISBN 90-247-2406-6 1.e. Brogan, ed., Nitrogen Losses and Surface Run-off from Landspreading of Manures. 1981. ISBN 90-247-2471-6 1.D. Bewley, ed., Nitrogen and Carbon Metabolism. 1981. ISBN 90-247-2472-4 R. Brouwer, I. Gasparikova, 1. Kolek and B.e. Loughman, eds., Structure and Function of Plant Roots. 1981. ISBN 90-247-2510-0 Y.R. Dommergues and H.G. Diem, eds., Microbiology of Tropical Soils and Plant Productivity. 1982. ISBN 90-247-2624-7 G.P. Robertson, R. Herrera and T. Rosswall, eds., Nitrogen Cycling in Ecosystems of Latin America and the Caribbean. 1982. ISBN 90-247-2719-7 D. Atkinson et aI., eds., Tree Root Systems and their Mycorrhizas. 1983. ISBN 90-247-2821-5 M.R. Sari
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9 10
10 9 8 7 6
5 12345678
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Fig. 2. Dry matter contents in cauliflower, lettuce, spinach, and tomato fruit after different nutrient supplies to the plants.
increase, which in turn can influence certain criteria, such as taste and aroma. As an example, the contents of amino acids in lettuce and potato tuber samples of the treatments with raised amounts of N in inorganic forms are given (Table 2). It is interesting to note that the highest concentrations are reached with glutamic acid in case of lettuce, but with aspartic acid in case of potato tuber, although the contents of all other amino acids are higher in the samples oflettuce. Corresponding to the amounts of crude protein, the concentrations of serine, glycine, alanine, valine, methionine, isoleucine, leucine and tyrosine in lettuce show a maximum in treatment 3, but those of the other amino acids are increasing steadily like the values of the potato tuber samples. The changes in the amounts of essential amino acids don't differ from not essential ones in these examples. Even the tomato fruit accumulates low molecular weight N-containing substances as glutamine and asparagine depending on the nitrogen supply (Fig. 4). In some countries there are limits set to the concentrations of nitrate in vegetable, because of its poisonous effect on infants and the possible
I
treatment
18 16LD
20
28 26 24 22
30
36 . 34 32
18 16
20
26 24 22
2 3 4 567 8
?Rinach
crude protein ./. of dry matter
9 10
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QI
::0
cauliflower
9 10
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=1
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1.76 2.22 2.77 3.55
1.93 2.26 3.62 4.17
Lettuce Treatment I 2 3 4
Potato tuber Treatment I 2 3 4
ASP
0.38 0.37 0.47 0.55
0.88 1.00 1.17 1.29
THR
0.36 0.33 0.39 0.46
0.75 0.96 1.08 1.07
SER
1.18 1.27 2.32 2.91
2.63 3.65 6.31 12.43
GLU
Amino acids, % of dry matter
0.37 0.37 0.45 0.53
0.88 1.02 1.34 1.94
PRO
0.35 0.36 0.40 0.44
1.00 1.13 1.36 1.30
GLY
0.37 0.37 0.37 0.46
1.01 1.18 1.48 1.37
ALA
0.55 0.57 0.68 0.77
1.17 1.33 1.92 1.68
VAL
0. 13 0.15 0.14 0.16
0. 16 0.17 0. 16 0.13
MET
0.45 0.46 0.49 0.55
1.22 1.02 1.30 1.28
I
