Fp = M2
-M1
/
1
/
2
(L1 + L2
)T (1)
Here:
Fp – photosynthesis productivity, mg cm-2 per 24 h;
M2 – M1 – increase of dry weight during the period of investigation (mg);
L1 + L2 – leaf area in the beginning of the period and at the end (cm2
);
T – duration of the period, in 24 h.
Plant photosynthesis potential was calculated by summing leaf area of every 24 h
and crop area – taking into account crop density. The investigations of photosynthesis
parameters were carried out in the Laboratory of Plant Physiology at the Lithuanian
Institute of Horticulture.
There were established in soil samples: pHKCl – by potentiometrical
(ISO 10390:2005), humus (%) – by dry burning (ISO 10694:1995), agile P2
O5
and
K2
O (mg kg-1)– by Egner-Rimo-Domingo (A-L, Gost 26208-84), mineral nitrogen
(mg kg-1) – by yonmetrical, calcium and magnesium (mg kg-1) – by atomic absorption
spectrometrical (SVP D-06) methods. Analyses were carried out in the Center of
Agrochemical investigations at the LIH.
Vegetables were gathered at the stage of technical maturity.
Data significance was evaluated by the method of one-factor dispersion analysis,
applying the program ANOVA, the relation among the different parameters – by 248
correlation regression analysis, the character and force of the interrelation – by
statistical analysis of the coefficients of the ways, applying the program STAT_ENG