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    Wyświetlanie 1-3 z 3
    Tytuł:
    Nutrient balances and field experimental studies
    Autorzy:
    Kadar, I
    Powiązania:
    https://bibliotekanauki.pl/articles/798361.pdf
    Data publikacji:
    1993
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    fertilization
    agriculture
    nutrient turnover
    soil
    nutrient balance
    mineral fertilizer
    poor acid soil
    winter wheat monoculture
    Hungary
    superphosphate
    Opis:
    The Author tries to find an answer to the question: how fertilization practice of our days meets the former fertilizing philosophy? When analysing the NPK balances of Hungarian agriculture, it can be seen that the surplus appearing in the nutrient galance-sheet is a consequence of intensive fertilization in the past. The Author discusses some important factors related to liming and fertilization on poor acid soils, K- and P-responses of some crops and soil fertility and future tasks with regard to mineral fertilization. In conclusion the Author presents an opinion that the need for mineral fertilizer in Hungarian agriculture could be minimized, having the same or even higher yield levels in the near future and applying about 20-30 % less NPK fertilizers based on a more sound recommendation.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 1993, 400
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of rock phosphates in sustainable agriculture: the Hungarian experience with Algerian rock phosphate
    Autorzy:
    Nemeth, T.
    Csatho, P.
    Osztoics, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/801085.pdf
    Data publikacji:
    1998
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    rock phosphate
    sustainable agriculture
    Hungary
    agriculture
    fertilization
    nutrient balance
    phosphate
    soil
    plant nutrient
    superphosphate
    Opis:
    From the early 60's till the late 80's, in many countries - among them also in Hungary - agricultural production went through a tremendous development. In Hungary there was a 2-3-fold increase in the average yields of winter wheat, and maize - the two main crops - in comparison to those of the 50's. One of the main factors determining these developments was the increasing use of mineral fertilizers. From the turn of the century till the late 50's, nutrient balances in Hungary were strongly negative: 20 - 30 kg/ha/year less N and K₂O, and 10 kg/ha/year less P₂O₅ was given to the fields in the different forms (farmyard manure, mineral fertilizer and by-products, etc.), than was removed by the harvested yields. Nutrient balances of P became positive in the early 60's, while balances of N and K in the early 70's, resp. Then, for 20 years, N balances were positive by 10 - 20 kg/ha/year, while both P₂O₅ and K₂O balances by 30 - 50 kg/ha/year, resp. These long-term positive nutrient balances resulted in the NPK enrichment of our soils, which was also proven by the national soil test series. During the 80's, for example, the amount of yearly applied mineral fertilizer was 230 - 280 kg/ha N + P₂O₅ + K₂O/arable land. In certain regions N leaching could cause environmental damage, while, as a result of the P-Zn antagonism, on the fields poorly supplied with Zn, overfertilization with P resulted in 1 - 2 t/ha/year maize yield losses. From the early 90's, however, when political and ecological changes took place in the country, the free market was introduced, and state subsidies on mineral fertilizer were withdrawn, there was a sharp decrease in mineral fertilizer use: applied N dropped to 1/5th, P and K to 1/20th of the amount used in the 80's. This dramatic decrease resulted in the change of nutrient balances: in 1991 the balance for N was -60, for P₂O₅ -30, and for K₂O -40 kg/ha for the whole country, resp. In 1992 and 1993 the situation was similar, while in 1994 a slight increase in mineral fertilizer use was observed. According to our estimation, mineral fertilization of 150 kg/ha/year N + P₂O₅ + K₂O is sufficient for long-term sustainable plant nutrition in Hungary, if farmyard manure application and the incorporation of byproducts remains on the recent level. During intensive fertilization practice, emphasis was on the quantity, while crop and soil demands for specific or more economic fertilizers were not taken into consideration. For N, lime ammonium nitrate, for P superphosphate, and for K, potash chloride was used on almost the whole area. As a new attempt to find more economic P sources, Algerian rock phosphate was checked in field trials, set up on characteristic acidic soils in different regions of Hungary, as well as other Central European countries. The first two-year results are discussed in the presentation.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 1998, 456
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soil phosphorus as plant nutrient and potential environmental pollutant
    Autorzy:
    Fuleky, G
    Powiązania:
    https://bibliotekanauki.pl/articles/806318.pdf
    Data publikacji:
    1993
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    Zala river
    environment pollutant
    maize monoculture
    soil
    plant nutrient
    Hungary
    phosphorus
    Opis:
    The usual range of P in soils is of the order of 500 to 800 mg kg⁻¹; in Hungarian soils it is 200-900 mg kg⁻¹ [3,9]. Total P is usually highest in the upper A horizon and lowest in the lower A and upper B horizons because of recycling by plants. The organic P content (10-60 % of total-P) is the highest in the top layer and decreases with depth in all soils [9].
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 1993, 400
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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