ADMS

The Institute of Soil Science and Plant Cultivation - State Research Institute in accordance with an Act from the Minister of Agriculture and Rural Development has developed the climatic water balance for all Polish municipalities (3,064 municipalities), and based on the soils categories have identified in those municipalities the current agricultural drought risk for the following crops: winter and spring cereals, corn for grain and silage, oilseed rape and turnip rape, sugar beet, potatoes, hops, tobacco, field vegetables, shrubs and fruit trees and strawberries and legumes.

In the third reporting period, i.e. from April 21 to June 20, 2015, IUNG-PIB state a risk of agricultural drought in Poland. The values of climatic water balance (CWB), which are the basis to assess the risk of drought, are negative over the entire range Poland.

In the current sixty days period threat to agricultural drought is listed among crops:

• spring cereals
• legumes

The biggest threat of drought in Poland occurs for spring cereals. Drought for the crop occurs in soils:

• I category (very light soil, granulometric group: sand
• II category (light soil, granulometric group: loamy sand)

The threat of drought for spring cereals is present in seven voivodeships in 412 local districts (13.4% of Polish local districts), on 3.2 % of Polish arable land.

Table 1 contains detailed data on the number of local districts and % of local districts and area of arable land for Voivodeships  where there is drought risk for the cultivation of spring cereals.

Drought risk for legumes  occurs of considered sixty days period on soils category I. It is present in 11 local districts (0.4% of local districts in the country) on 0.1% of the arable land. The data on these crops is shown in Table 2.

The lowest value of CWB occurred in exactly the same areas as in the previous sixty days period. The lowest CWB values were in the central and eastern part of the Wielkopolska Lake District. north-western part of the Lodz Voivodeship. Kutno Plain and Kujawski Lake District. reaching from -160 to -179 mm. Low values CWB  were also recorded in Pomorskie. Lubuskie. Dolnośląskie and Opolskie Voivodeship and in eastern part of the Warmia-Mazury and Mazowieckie Voivodeship reaching from -130 to -149 mm.

While the highest CWB value (below -50 mm) was recorded in western parts of Lubelskie highland and southern parts of Śląskie. Małopolskie and Podkarpackie.

During the current sixty days period. the value of CWB on Polish territory compared to the previous reporting period have slightly decreased. On average for the country CWB value compared to the previous period were lower by 5 mm.

April this year was within the norm in the area of the Gdansk. thru out the central territory of the country. in the Lublin region and the eastern parts of Poland; while the remaining areas of the country recorded temperature higher than the average by 0.5 to 1.5°C. The highest deviation from the mean temperature. i.e. warmer than the long term norm was near Gdansk. on the coast. in the Lubuskie region and in the Silesian Lowland. The highest air temperature occurred in western Poland. reaching more than 9°C in the Lubuskie region.  Silesian Lowland and Upland. On the large area of the country air temperature was from 8 to 9°C. In the north of the country. in the eastern part. the temperature was lower and ranged from 6 to 7°C.

May this year in terms of temperature was relatively low. The highest air temperature occurred in in the south-western part of the Poland. reaching 13-13.5°C. In most parts of the country were recorded temperatures from 12 to 13°C. The coolest was in the north. and in these areas air temperature was from 10 to 12°C.

Temperature system in the first 20 days of June saw a parallel character. The lowest temperature occurred in the north of the country and the highest in the southern parts of Poland. In the first ten days of June on the Baltic coast and in Żuławy recorded below 15 ° C. While in the second ten days of June it was cooler. even below 14°C.

In the southern part of the Pomorskie and the Mazury Lake District. Podlasie Lowland. and in the Lubuskie region air temperature ranged from 15 ° C to 17 ° C (first ten days of June) and 15°C to 17°C(second ten days of June). The temperature from 17°C to 19°C were observed in Polish Highlands (first ten days of June) the second decade was already colder 16°C to 17°C. In contrast. the highest temperature (above 19 ° C) was recorded in the Sandomierz Basin. Beskid Niski and in the vicinity of Krakow and Opole. Such thermal conditions were recorded in the first ten days of June. in the second ten days of June it was colder with temperatures approx. 17.5°C.

In April. a high diversity of precipitation was found. Very low rainfall. less than 20 mm occurred in Lake Districts: Poznańskim. Gnieźnieńskim. Krajeńskim. Szczecineckim. Wałeckim. as well as in Zielonogórskie hills. Śląskie lowlands. and they accounted in this area for 50 to 60% of long-term norm. Low rainfall ranging 20-30 mm occurred in most parts of the country. acting in these regions as 60-90% of norm. On the other hand should also be pointed relatively high precipitation occurring Lithuanian Lake District and on the Gdansk Embankment. precipitation in those regions was from 40 do80 mm. representing between 110 to 150% of long-term norm. The highest precipitation more than 100 mm was recorded in the Tatra Mountains.

May this year in terms of precipitation was varied. The lowest occurred over a large area in the western and central parts of the country. The lowest rainfall occurred especially in  Lubuska region. Wielkopolska and in Kujawy. even less than 20 mm. The further east of these areas. the rainfall values were higher. The highest precipitation was recorded in the Lublin Upland and in the eastern and western Beskidy. in Podhale and Tatry. from 100 to over 220 mm.

Precipitation in the first decade of June in most parts of the country were relatively low (less than 5 mm). Slightly more than 5 to 20 mm of precipitation occurred in the south-western part of the country and in the southern part of the Mazowieckie Voivodeship and the central of Świętokrzyskie Voivodeship. Larger rainfall (20 to 50 mm) were traded in the western part of the Sudety Mountains. in the southern parts of Lubuskie voivodeship and in the western part of the Wielkopolski Lake District. In contrast. over 50 mm rainfall was recorded in the Karkonosze Mountains.

The second ten days of June was characterized by a very large variation in the occurrence of precipitation. Relatively high precipitation occurred over a large area of the southern Poland and especially in the south - west and the northern part of the country. ranged from 20 to 50 mm and in some places even greater than 50 mm. By contrast. relatively small and very low rainfall were recorded in the eastern and especially in the north-eastern part of the country and in the Central Polish Lowlands lane from 5 to 20 mm of rainfall and  in some places even lower than 5 mm.

In the country still  occurred very large variation in terms of water resources for crops. In the western part of the Central Polish Lowlands it recorded a large deficit of water. which can result in a significant reduction in yields. Especially with regard to crops located on weak and very weak soils. on heavy soils water scarcity it is less noticeable.