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<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008location, the quantity of nodes per plant and the level of yield capacity has a parabolic character,i.e. these indices increased the margin of the nutrition area, interrow width and plant density.Further increase of the nutrition area and interrow width and the reduction of plant density countingthe unit of the area did not provide an increase of the indices of the structure and yield capacity offield beans, but their gradual reduction (fig.2).Thus, when increasing the nutrition area from 48 tо 303 сm 2 , and the interrow width from 10tо 75 сm and reducing the plant density from 2016 tо 266 thousands per hectar plant weightincreased from 5,8 tо 42,5 g, the thickness of the stem base – from 0,4 rо 1,65 сm, the quantity ofproductive nodes per plant – from 2,9 tо 9,5 units., beans – from 3,2 to 10,8 units, seeds – from 7,2tо 27,0 units., seed weight per plant – from 1,2 tо 12,4 g (table 1, 2).Dependence of field bean plant weight on the nutrition area, interrow width and plant densitycan be presented by the following regression model:У 1 = - 81,1791 – 2,1245Х 1 + 16,1903Х 2 + 1,1574Х 3where,У 1 – plant weight, gХ 1 – nutrition area, сm 2Х 2 - plant density, thousands per hectarХ 3 – interrow width, сmSeed mass per plant, g1816141210864202061 1360 975 784 660 596 500 445 401 359 330 305 284 26648 74 102Plant density, thousandsper hectar127 151 176 200 225 249 278 303 327 351 376Nutrition area, cm 25,34,94,54,13,73,32,92,5Yield capasiti, t/heSeed mass per plant, gYield capaciti, t/heFigure 2 The characteristics of the changes of individual field beans and the grainproductivity of field beans depending on the influence of space and quantitative plant locationA strong positive connection is observed between the plant weight and the nutrition area,interrow width and plant density. The coefficient of multiple correlations equals 0,966. It isestablished that field beans are inclined to lodging when the thcknessof the stem base is reduced upto 0,63 cm. As a rule this is an interval of the nutrition area 48 to 127 сm 2 , interrow width from10 tо 25 сm, plant density from 2061 tо 784 thousands per hectar.Dependence of node quantity per plant on the nutrition area, interrow width and plant densityis described by the equation of multiple regression:158
<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008У 2 = - 17,1126 + 1,1748Х 1 - 0,1304Х 2 + 0,2769Х 3where,У 2 – quantity of productive nodes, units.Х 1 – nutrition area, сm 2Х 2 - plant density, thousands per hectarХ 3 – interrow width, сmA strong positive connection is observed between the quantity of productive nodes andfactors studies in the model trial (r = 0,988).Table 1. The formation of the indices of field bean structure depending on the influence of spaceand quantitative plant location (in average in 1998-2006)Nutritionarea, сm 2Interrowwidth, сmPlant density,thousands perPlant weight, g Plant height,сmHeight of thebottom beanThickness ofthe stembase, сmhectarlocation, сm48 10 2061 5,8 80,5 49,8 0,4074 15 1360 7,3 82,9 46,7 0,45102 20 975 8,6 84,2 46,4 0,52127 25 784 10,2 86,4 46,0 0,63151 30 660 12,1 88,6 44,9 0,75176 35 596 12,5 90,9 43,5 0,78200 40 500 16,8 91,7 43,0 0,86225 45 445 20,3 92,2 43,0 0,93249 50 401 21,5 93,5 43,0 1,00278 55 359 22,0 85,3 40,5 1,15303 60 330 23,1 87,0 38,6 1,27327 65 305 25,9 82,2 38,3 1,35351 70 284 35,5 81,8 38,0 1,57376 75 266 42,5 80,9 31,8 1,65Dependence of bean quantity per plant on the nutrition area, interrow width and plant densityis described by the equation of multiple regression:У 3 = - 5,2077 + 0,3121Х 1 + 1,1103Х 2 + 0,0542Х 3У 3 – quantity of beans, unitsХ 1 – nutrition area, сm 2Х 2 - plant density, thousands per hectarХ 3 – interrow width, сm.For effective index У 3 coefficient of multiple correlation equals 0,993. It testifies to a closepositive connection.The size of the nutrition area, interrow width and plant density also influence the seedquantity per plant and the weight of these seeds. Revealed dependences are described by thefollowing equations of multiple regression:У 4 = - 19,1209 + 1,4842Х 1 + 1,7387Х 2 + 0,2229Х 3У 4 – seed quantity per plant, units.Х 1 – nutrition area, сm 2Х 2 - plant density, thousands per hectarХ 3 – interrow width, сmУ 5 = - 13,0450 + 0,8093Х 1 + 1,4746Х 2 + 0,0828Х 3У 5 – seed weight per plant, gХ 1 – nutrition area, сm 2Х 2 - plant density, thousands per hectarХ 3 – interrow width, сm159
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