Search

In the study carried out in 8 villages and 27 cotton parcels of Mardin Province Artuklu and Kızıltepe Districts, ambient humidity and temperature values in the field were measured and recorded with data logger devices at 6-hour intervals. The data obtained from the data loggers were analyzed with the Sentinel-1 and Landsat-8 satellite data prepared in the Google Earth Engine (GEE) environment and the relationship between them was examined. While a high correlation was found between ambient humidity (ON) values and VV (R²=0.63), VV-VH (R²=0.68), Soil Moisture Index (SMI) (R²=0.84), low correlation was found between VV (R²=0.51), VH (R²=0.06), VV-VH (R²=0.49), LEE_VH (R²=0.09), LEE_VV (R²=0.49), GAMMA_VH (R²=0.11, GAMMA_VV (R²=0.08), MALIK_VH (R²=0.08), MALIK_VV (R²=0.49), SMI (R²=0.50). A high correlation was found between ambient temperature (OS) values and Land Surface Temperature (LST) (R²=0.80**). However, a low correlation was found between ambient temperature (OS) and VV (R²=0.51), VH (R²=0.06), VV-VH (R²=0.49), LEE_VH (R²=0.09), LEE_VV (R²=0.49), GAMMA_VH (R²=0.11, GAMMA_VV (R²=0.08), MALIK_VH (R²=0.08), MALIK_VV (R²=0.49), SMI (R²=0.50). In large-scale field studies; VV, VV-VH and SMI index in estimating ambient humidity values; as it was concluded that the LST band can be used with high accuracy in estimating ambient temperature values, it has been recommended. [ABSTRACT FROM AUTHOR]

A field study was conducted to determine effects of different deficit water level on yield, water use efficiencies and some yield properties of corn in Aydýn province during 2009. The irrigation treatments were based on soil water depletion replenishments. Irrigation was applied when 50% of available soil moisture was consumed in the 0.90-m root zone at T treatment during the irrigation periods. Control treatment “T ” was designated to 100 100 receive 100 % soil water depletion. In treatments, T ; T ; T ; T and T irrigations were applied at the rates of 80, 80 60 40 20 0 60, 40, 20 and 0 % of control treatments, (T ) on the same day, respectively. According to results, the seasonal 100 water use and yield values ranged from 134 to 737 mm and 251.9 to 1365.9 kg/da, respectively. Water deficit significantly affected the crop yields. Highest corn yield was obtained from the full irrigation treatment (T ). The 100 water use efficieny (WUE) values varied from 1.85 to 2.26 kg/da/mm. Yield response factor (k ) value of 0.92 was y determined. Some yield properties were influenced by drip irrigation levels in growing season. The results revealed that well irrigated treatments (T ) could be used for the semiarid climatic conditions under no water 100 shortage. On the other hand, the results also demonstrated that irrigation of corn with drip irrigation regime at 60 % level (T ) had significant benefits in terms of saved irrigation water and high WUE indicating a definitive 60 advantage of deficit irrigation under limited water supply conditions. [ABSTRACT FROM AUTHOR]