11
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Humus composition in some Red soils in Algeria and cinnamonic forest soils in Bulgaria
Artinova, N ; Gribachev, P
Nauchni trudove - Vissh selskostopanski institut "Vasil Kolarov", 1983, Vol.28 (3), p.71-76
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12
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Soil thermo-hygrometer
Meshkov, L
Selskostop Tekh, 1972, Vol.9 (2), p.65-70
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13
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Flower cultivation without soil
Boboshevska, D
Gradinarstvo, 1980, Vol.61 (7), p.11-13
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14
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Some soil-hydrological constants
Stefanov, S.N
Selskostop Nauk, 1970, Vol.9 (3), p.51-59
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15
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Soil maintenance in orchards
Keremidarska, S. (Institut po Ovoshcharstvo, Kyustendil (Bulgaria))
Ovoshcharstvo (Bulgaria), 1977, Vol.56 (1)
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16
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Formation of Solonetz and alkaline Podzol soils
Dimitrov, G
Nauchni trudove - Vissh selskostopanski institut "Vasil Kolarov", 1980, Vol.25 (1), p.119-126
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17
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Microflora related to nitrogen in soils
Voĭnova-Raĭkova, Zhivka
Sofii︠a: Zemizdat 1977
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18
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Valuation of the fertility of forest soils
Naumov, Z
Gorsko stopanstvo, 1976, Vol.32 (7), p.12-16
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19
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Surface runoff from Grey forest soils
Nikolov, S ; Daskalov, I ; Georgiev, G.S ; Chung, D.V
Pochvoznanie i agrokhimiia. Soil science and agrochemistry, 1978, Vol.13 (1), p.105-110
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20
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Physical-mechanical properties of leached Smolnitza soils
Ralchev, A
Natsionalen kongres po pochvoznanie, 1st, Sofia, 1969, 1972, p.105-110
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