Analiza fizikalnih lastnosti šotnega substrata

Tilen ZAMLJEN, Ana SLATNAR, Vesna ZUPANC

Povzetek


Šotni substrat je glavni substrat, ki se v rastlinski pridelavi uporablja predvsem za vzgojo sadik vrtnin in okrasnih rastlin. Šotni substrat ima dobre vodo zadrževalne lastnosti, majhno maso, nizek pH ter nima bolezni in škodljivcev. Predvsem vodo zadrževalne lastnosti so pomembne za optimizacijo namakanja in s tem porabo vode pri gojenju rastlin. Preverili smo vodo zadrževalne lastnosti neuporabljenega in rabljenega šotnega substrata ter različne mešanice substratov (šota z dodatki) in pojav vodoodbojnosti, saj le-ta vpliva na sprejem vode v substrat. Analizirane  mešanice neuporabljenega šotnega substrata z dodatki so zadržale med 3,4 % in 18,4 % več vode kot rabljene substratne mešanice. Dnevne izgube vode so pri rabljenih substratnih mešanicah, ob izhodiščno manjši vsebnosti vode ob polnem nasičenju, manjše. Pri neuporabljenem šotnem substratu je bila pri tenziji med 10 in 33 kPa količina vode med 25 in 32 %. Točka venenja (TV) za neuporabljen šotni substrat je med 300 in 1500 kPa oziroma med 15 in 18 %. Šotni substrat ima širok interval poljske kapacitete ter hiter prehod iz območja poljske kapacitete do točke venenja (med 7 in 10 %). Ob sušenju vodoodbojnost tako neuporabljenega kot rabljenega šotnega substrata narašča.


Ključne besede


šota; fizikalne lastnosti substratov; vodoodbojnost; substrat; tenzija; vsebnost vode

Celotno besedilo:

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Literatura


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DOI: http://dx.doi.org/10.14720/aas.2020.116.2.1851

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