ACTA AGRONOMICA TOMUS 23. (A MTA AGRÁRTUDOMÁNYI KÖZLEMÉNYEI, 1974)

1974 / 1-2. szám - VARIA - R. R. SINGH-M. S. GANGWAR: Critical boron concentration and calcium-boron balance as related to the boron need of sugarbeet

108 VARIA Foliage: the number of leaves is theoreti-ally 18, hut only 8—12 useful leaves are left on the stem. The leaves are petioled, their blade is rounded heart-shaped, crumpled, with a shiny surface and dark yellowish green colour. The leaves hang downward and fall close on each other (hence its name; "suba" is a wide sheep­skin-coat reaching down to the heels). The leaves are covered with thick hairs. The petiole is fleshy, 10—15 cm long. Inflorescence: moderately thick-set; cylindrical-roundish polychasium. The number of floral laterals is 16 on an average, and the number of flowers 230—240. Flowers: stubby of an average length of 23 mm; calyx-tube stocky, half-egg shaped, lacinate; corolla-tube cylindrical, short and greenish yellow. Limbus Fruit: indented by blunt lobes, undulate, 17 mm in diameter. Anthers yellow. round, round capsule of an average length of 10 mm, dehiscing at the apical part with a narrow slit. The number of capsules reaching maturation is 220. Seed: small, brown; thousand-grain-weight; 27.7 eg. Biological character: Vegetation period: 80—90 days; flowering from the second decade of July. Water requirement : responsive to groundwater; high yielding in moist soils (KAPÁS et al. 1965) Resistance to diseases: fairly good. Farm technology requirement: Seeding: in the second half of March in a hot-bed. Soil requirement: loam-, clay- and peat soils rich in nitrogen are preferred; the high humus content is important. Productivity : the leaf yield is 15—17 q/ha, its nicotine content ranges between 2 and 5 per cent. Region of cultivation : heavy soiled, high nutrient content tobacco growing areas of the Trans-Tisza, further the districts of Balatonnagyherek and Pápa (MÓGER—Szűcs 1966). Prepared at the Department of Botany, University of Agrarian Sciences, Debrecen REFERENCES GY. MÁNDY KAPÁS, S. —KOMJÁTI, I, — PAPP, ZS. —SZERAFIN, J.—TOMCSÁNYI, P. (1965): Minősített növényfajtáink (Improved Hungarian plant varieties). Mezőgazdasági Kiadó, Buda­pest. MÓGER, J.-Szűcs, К. (1966): A dohány termesztése (Tobacco growing). Mezőgazdasági Kiadó, Budapest. CRITICAL BORON CONCENTRATION AND CALCIUM-BORON BALANCE AS RELATED TO THE BORON NEED OF SUGARBEET Boron has a profound influence on the yield and quality of sugarbeet. BRANDENBURG (1931) working with the sugarbeet was the first to demonstrate clearly in the field that heart rot in sugarbeet was due to boron deficiency and could be prevented by boron application. A preliminary study has also indicated response to boron application in terms of beet yield at Pantnagar (India). In view of the increasing importance of this new crop, a need was felt that Acta Agronomica Academiae Scientiarum Hungaricae 23, 1974

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