Kabuk bağlama problemi bulunan bir toprağın ıslahına sıvı hümik asit uygulamasının etkisinin inkübasyon çalışmasında belirlenmesi

Zayıf strüktürel özellikler sahip toprakların en önemli problemlerinden bir tanesi yüzeyde kaymak tabakası oluşmasıdır. Özellikle genç alüviyal topraklarda taşınma esnasında toprak strüktürleri bozularak agregat stabiliteleri düşmektedir. Bu tip topraklarda tekrar strüktür gelişimi ve agregat stabilitesi artışı, özellikle kurak ve yarı kurak alanlarda, yağış yetersizliği nedeniyle uzun zaman almaktadır. Konya ovası topraklarında da bu durum yaygın olarak görülmektedir. Bu nedenle yapılan çalışmada, sıvı hümik asit uygulamasının kil tekstürlü, zayıf strüktürel özelliğe sahip bir toprağın agregat stabilitesi ve kırılma değeri ile bazı kimyasal özellikleri üzerine etkileri inkübasyona çalışmasında belirlenmiştir. Çalışma laboratuvar koşullarında yürütülmüş olup; %0.5, %1, %2 ve %4 dozlarında uygulanan sıvı hümik asittin etkileri 25, 50 ve 75 günlük inkübasyon süreleri boyunca ölçülmüştür. Araştırmada sıvı hümik asit uygulamalarının kabuk oluşumunu doğrudan etkileyen toprak özelliklerinden olan kırılma değeri, agregat stabilitesi ve organik karbon ile toplam azot, pH ve elektriki iletkenlik (EC) değişimine etkileri incelenmiştir. Buna göre, kırılma değerlerinde kontrole göre tüm inkübasyon sürelerinde düşüş tespit edilmiş olup, inkübasyonun 25. gününde %4 sıvı hümik asit uygulaması kırılma değerini %38.6 oranında azaltırken; inkübasyonun 50. gününde %4 sıvı hümik asit uygulaması agregat stabilitesini %81.4 oranında artırmıştır. pH üzerine uygulamaların etkisi önemsiz çıkmış, EC değerini 25, 50 ve 75 günlük inkübasyon periyotlarında en yüksek hümik asit uygulaması kontrole göre sırasıyla %73.3, 79.4 ve 77.5 oranlarında artırmıştır. Ayrıca sıvı hümik asidin uygulama dozu artışına bağlı olarak toprağın organik karbon, toplam azot içerikleri de artışlar göstermiştir. Buna göre, sıvı hümik asit uygulamasının 25 günlük bir inkübasyon süresinde dahi toprakların ölçülen fiziksel ve kimyasal özelliklerinde değişiklikler ve iyileştirmeler yapabileceği belirlenmiştir.

Anahtar Kelimeler:

Agregat stabilitesi, kırılma değeri, sıvı hümik asit, zayıf strüktür

Composing the database of thrace soils and some soil characteristics

One of the most important problems of soils endowed with weak structural characteristics is the formation of crust layer on the surface. Especially in a young alluvial soils, aggregate stability decreases by degrading soil structures during transportation. Due to insufficient precipitation, rebuilding of structure development and increasing aggregate stability in these types of soils, especially in arid and semi-arid areas, take a long time. This situation is common in Konya plain. Therefore, in the study, the effects of liquid humic acid application on the aggregate stability and rapture value, as well as some chemical properties of a clay textured and weak structured soil were determined under incubation experiment. The study was conducted under laboratory conditions; the effects of liquid humic acid applied at a dose of 0.5, 1, 2 and 4% were measured during incubation period of 25, 50 and 75 days. In this research, the effects of liquid humic acid applications on soil crusting formation, which directly affect modulus of rupture value, aggregate stability and organic carbon and total nitrogen, pH and electrical conductivity (EC) changes, were investigated. According to the results, it was found that modulus of rupture values decreased in all incubation periods in comparison with control and while application of 4% of liquid humic acid decreased modulus of rupture value by 38.6% on the 25th day of incubation, 4% liquid humic acid application increased the aggregate stability by 81.4% on the 50th day of incubation. The effect of the applications on pH was insignificant, and the highest value of EC in 25, 50 and 75 days of incubation period increased by 73.3, 79.4 and 77.5%, respectively at the highest applied dose of liquid humic acid relative to the control. Additionally, it was observed that organic carbon and total nitrogen contents of the soil increased with increasing application doses. Accordingly, it was determined that the application of liquid humic acid could make changes and improvements in the measured physical and chemical properties of soils within the 25-day of incubation period.

Keywords:

Aggregate stability, modulus of rupture, liquid humic acid, weak structure,

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