Agronomy journal, Vol. 36 No. 7-8, 1974.
Original scientific paper
DYNAMICS OF ORGANIC MATTER SYNTHESIS AND N, P AND K UPTAKE IN NSSC-7O MAIZ
Boriša Spasojević
; Poljoprivredni fakultet Novi Sad
Abstract
The dynamics of organic matter synthesiss in maiz can be taken as a sure indicator in plant water supply, mineral supply etc'. In order to solve the samples were taken above task in 1967, 1968 sary to know the dynamics of N, P and K uptake in each maiz parts in different phenological phases. Hence the aim of our investigations were two points. In order to solve the samples were taken above taks in 1967,1968 ana 1969 from a stationary experiment which lasted for several years, at the Institute of Agricultural Research in Novi Sad. The experiment was located on carbonate chernozem soil which con - tained 0,175% N; 11,9mg P₂O₅ and 24 mg/100 gr of K₂O soil. The cliimatic conditions were the most favourable in 1967 for maiz growing, however, they were the less favourable in 1968, and in 1969 they were medium favourable. On the basis of the results obtained after three years research it can be concluded: The organic matter synthesis in maiz NSSC-70 was very slow in the first phenological phases. Only from 7-9 lesf phases a more intensive organic matter synthesis started and that was increasing steadily to full maturity. The highest synthesis was between pollination and milky maturity. In full maturity the total dry matter weight was distributed in the various parts of the plant in the following way: 22% in the stalk and sheaths; 9,5% leaves; 0,9% tassel; 6,6% in the rapping leaf of the corncob (ear); 7,7% cob and 53,3% in the grain or 95,56% in q/ha, and finally 83,61 q/ha in the rest of the over-graund mass. The maximum dry matter yield was obtained in stalk, leaves and tassel in pollination phase, however in rapping leaves of the corncob it was obtained in milky maturity. There is a deciease in dry matter weight from that phase to the full maturity in these parts and it was translocated in the grain and cob and all the newly formed organic matter was deposited directly in to the grain. There is a small uptake of N, P and K at the beginning of the phenological phases in maiz. The most intensive uptake of these elements was between 10-12 leaves and pollination, however, it decreased later. There was final uptake of 36,3% phosphorus; 17,8% nitrogen and 6,79% potassium of maiz from pollination to the end of vegetation. On the basis dynamics of N, P and K uptake we concluded that maiz should be provided with optimal nutrition in nitrogen and potassium till milky maturity, however, in phosphorus to the end of the vegetation. The uptake of N, P and K from the soil was dependent on a series of factors. Under our conditions at the average norm of 257 kg/ha NPK nutrition (107:90:60), there was uptake of 1,9 kg nitrogen; 0,35 kg phosphorus and 0,96 kg potassium for one q of absolute dry grain and coresponding amount of over-ground vegetitive mass.
Keywords
Hrčak ID:
165140
URI
Publication date:
29.9.1974.
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