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APPARENT SPECIFIC GRAVITY AND SOIL MOISTURE INTERVAL AS FACTORS IN GROWING WINTER WHEAT
Anđelko Butorac
; Poljoprivredni fakultet Zagreb
Frane Tomić
; Poljoprivredni fakultet Zagreb
Ivan Turšić
; Poljoprivredni fakultet Zagreb
Sažetak
The paper presents the results of preliminary investigations into the effects of apparent specific gravity and the soil moisture interval, and also of their combinations, upon the yield of winter wheat and the nitrogen content in the grain. The investigations were carried out on for different soil types in greenhouse model experiments: on red soil, pseudogley, brown soil on carbonate less and alluvial soil. For each soil type three different apparent specific gravities were tested - 1.2,1.4 and 1.6 kg/cu. dm, and there different moisture intervals - 0.33 to 1.00, 0.33 to 6.25 and 0.33 to 15.00 atm, as well as their combinations. Before the experiment was set up, the main physical and chemical properties of the soil were determined (Tables 1, 2 and 3). The results relating to the grain and straw yields and the nitrogen content in wheat grain are presented accoRding to soil types and the investigated factors in Tables 4-8 and in Graphs 1-9. It can be generally stated that the apparent specific gravity of the soil had various effects upon the grain and straw yields of winter wheat and that the medium or highest apparent specific gravity was regularly better than its low value. The effects of the soil moisture interval on the grain and straw yields was less variable, for in almost all cases there was a tendency of highest efficiency at the lowest moisture interval. The combinations of the apparent specific gravity and the soil moisture interval, though showing some interactional effect, did not give enough elements for drawing a firm conclusion about their reciprocal compensation or their optimal effect. The effect of the investigated factors on the nitrogen content in winter wheat grain varies considerably, both as regards their individual and mutual effects. There was no effect of the moisture interval, while the effect of the apparent specific gravity was felt only in an indirect way. Although the investigations were only orientational, they enabled, from the aspect of the investigated factors, to determined the interrelation of the more important physical properties in relation to the grain and straw yield and the accumulation of nitrogen in wheat grain. They also give the guidelines for further investigations, particularly those to be carried out in the field.
Ključne riječi
Hrčak ID:
165513
URI
Datum izdavanja:
24.9.1975.
Posjeta: 2.522 *