Öz
The purpose of this study was to characterize spatial and temporal variations in soil physical properties and to
examine possible differences that might occur when the crop rotation shifted to rice cultivation. Soil samples from
0-20 cm and 20-40 cm depth were collected on a 100×100 m grid basis over a 45 ha field, in May 2005 and May
2011. The geostatistical methods were used to model the variance structure of gravimetric water content (GWC),
soil bulk density (BD), penetration resistance (PR) and aggregate stability (AgS). The coefficient of variations were
17.5% for GWC, 7.1% for BD, and 25.0% for PR at surface and 12.8% for GWC, 6.7% for BD, and 17.1% for PR
at subsurface. PR at subsurface (>2MPa) and BD at surface and subsurface soils (1.47 g cm-3) exceeded the
threshold values in some fields of the study area. Temporal variations of GWC and PR at 0-20 cm and 20-40 cm
depths were significant (P<0.01) while BD was significantly varied only at 20-40 cm. Spatial correlation ranges of
GWC, BD and PR varied from 72 m to 433 m in 2005 and 40 to 1524 m in 2011. The spatial dependences of GWC,
BD and PR at surface were moderate, and AgS had strong dependency at this depth. The spatial distribution maps
of soil physical attributes are useful in identifying the limiting factors and take necessary precaution to prevent
further loss of soil quality.
Anahtar Kelimeler
Öz
The purpose of this study was to characterize spatial and temporal variations in soil physical properties and to examine possible differences that might occur when the crop rotation shifted to rice cultivation. Soil samples from 0-20 cm and 20-40 cm depth were collected on a 100×100 m grid basis over a 45 ha field, in May 2005 and May 2011. The geostatistical methods were used to model the variance structure of gravimetric water content (GWC), soil bulk density (BD), penetration resistance (PR) and aggregate stability (AgS). The coefficient of variations were
17.5% for GWC, 7.1% for BD, and 25.0% for PR at surface and 12.8% for GWC, 6.7% for BD, and 17.1% for PR at subsurface. PR at subsurface (>2MPa) and BD at surface and subsurface soils (1.47 g cm-3) exceeded the threshold values in some fields of the study area. Temporal variations of GWC and PR at 0-20 cm and 20-40 cm depths were significant (P<0.01) while BD was significantly varied only at 20-40 cm. Spatial correlation ranges of GWC, BD and PR varied from 72 m to 433 m in 2005 and 40 to 1524 m in 2011. The spatial dependences of GWC,
BD and PR at surface were moderate, and AgS had strong dependency at this depth. The spatial distribution maps of soil physical attributes are useful in identifying the limiting factors and take necessary precaution to prevent further loss of soil quality.
Anahtar Kelimeler
Ayrıntılar
| Birincil Dil | İngilizce |
|---|---|
| Bölüm | Makaleler |
| Yazarlar | |
| Yayımlanma Tarihi | 4 Mart 2012 |
| Gönderilme Tarihi | 8 Şubat 2012 |
| Yayımlandığı Sayı | Yıl 2012 Cilt: 18 Sayı: 1 |
Cited By
Buğday Ekim Alanlarında Sorun Oluşturan Yabancı Ot Türleri: Siirt İli Örneği
Türkiye Tarımsal Araştırmalar Dergisi
https://doi.org/10.19159/tutad.453465
Journal of Agricultural Sciences is published open access journal. All articles are published under the terms of the Creative Commons Attribution License (CC BY).