Bu çalışmada, farklı humik asit ve azotlu gübre uygulamalarının iki farklı marul
bitkisinin besin maddesi içerikleri ile hasat sonrası bazı toprak özellikleri üzerine etkisi
araştırılmıştır. Bu amaçla amonyum nitrat ve üre gübresiyle birlikte iki farklı sıvı
humik asidin 0-400-800-1200 mg kg-1
dozları uygulanmıştır.
Araştırma sonuçlarına göre en yüksek yaş ve kuru ağırlık Model marul çeşidinde 800
mg kg-1
humik asit dozunda ve amonyum nitrat gübre uygulamasından elde edilirken;
Carmesi marul çeşidinde 800 ve 400 mg kg-1
dozunda sırasıyla üre ve amonyum nitrat
gübresinden elde edilmiştir. Bitkilerin nitrat, toplam N, Ca, Cu, Zn ve Mn içeriklerinin
artan humik asit dozu ile birlikte genellikle düzenli bir şekilde arttığı; Mg içeriğinin
ise genellikle düzenli bir şekilde azaldığı belirlenmiştir. Bitkinin K içeriğinde
genellikle 800 mg kg-1
, bitkinin Fe içeriğinde ise 800 ile 1200 mg kg-1
düzeyine kadar
arttığı saptanmıştır.
Hasat sonrasında toprak pH’sının 400 mg kg-1
humik asit dozundan sonra azaldığı,
toprakta fosforun ise düzenli bir azalma eğiliminde olduğu saptanmıştır. Toprağın N
ve K içeriklerinde düzenli bir artış gözlenirken; toprağın Fe, Cu, Zn ve Mn
içeriklerinin 800 mg kg-1
‘a kadar düzenli bir şekilde arttığı tespit edilmiştir. Humik
asit ve azotlu gübre çeşitleri ile humik asit uygulama dozlarının gerek marulun bitkisel
özelliklerinde ve gerekse toprak özelliklerinde istatistiki bakımdan önemli etkilerde
bulunduğu belirlenmiştir.,In this study, effects of different humic acid and nitrogen fertilizers applications on the
nutrient contents of two different lettuce plants and some soil properties after
harvesting were investigated. For this purpose, doses of 0-400-800-1200 mg kg-1
of
two different liquid humic acids were applied together with ammonium nitrate and
urea fertilizer.
According to the results of the study, while the highest fresh and dry weight in Model
lettuce cultivar was obtained from 800 mg kg-1
humic acid and ammonium nitrate
fertilizer application, in Carmesi lettuce cultivar 800 and 400 mg kg-1 was obtained
from urea and ammonium nitrate fertilizer respectively. The nitrate, total N, Ca, Cu,
Zn and Mn content of the plants increased with increasing dose of humic acid, but Mg
content was generally determined to decreased regularly. The potassium content of the
plant generally increased until 800 mg kg-1
, and Fe content increased until 800-1200
mg kg-1
humic acid doses.
It was determined that post harvest the soil pH decreased after 400 mg kg-1
humic acid,
and phosphorus in soil was decreased regularly. Nitrogen and K contents of the soil
were observed in a regular increase; Fe, Cu, Zn and Mn contents of soil were
determined to increase regularly until 800 mg kg-1
. As a result, it has been that the
application doses of humic acid and nitrogen fertilizers types have statistically
significant effects on both growth of lettuce and soil properties.
In this study, effects of different humic acid and nitrogen fertilizers applications on the
nutrient contents of two different lettuce plants and some soil properties after
harvesting were investigated. For this purpose, doses of 0-400-800-1200 mg kg-1
of
two different liquid humic acids were applied together with ammonium nitrate and
urea fertilizer.
According to the results of the study, while the highest fresh and dry weight in Model
lettuce cultivar was obtained from 800 mg kg-1
humic acid and ammonium nitrate
fertilizer application, in Carmesi lettuce cultivar 800 and 400 mg kg-1 was obtained
from urea and ammonium nitrate fertilizer respectively. The nitrate, total N, Ca, Cu,
Zn and Mn content of the plants increased with increasing dose of humic acid, but Mg
content was generally determined to decreased regularly. The potassium content of the
plant generally increased until 800 mg kg-1
, and Fe content increased until 800-1200
mg kg-1
humic acid doses.
It was determined that post harvest the soil pH decreased after 400 mg kg-1
humic acid,
and phosphorus in soil was decreased regularly. Nitrogen and K contents of the soil
were observed in a regular increase; Fe, Cu, Zn and Mn contents of soil were
determined to increase regularly until 800 mg kg-1
. As a result, it has been that the
application doses of humic acid and nitrogen fertilizers types have statistically
significant effects on both growth of lettuce and soil properties.
