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EN
The mealybug, Phenacoccus solenopsis (Hemiptera: Coccomorpha: Pseudococcidae), is one of the main pests attacking maize plants in Egypt. Field trials were carried out in the maize field to assess the influence of irrigation periods and potassium fertiliser rates on the mealybug (P. solenopsis) population estimates, vegetative growth, resulting yield, and its components for the maize cultivar (‘Single-Hybrid 168 Yellow’) in the Luxor Governorate, Egypt. Results revealed that unfertilised plants irrigated every seven days had higher pest population densities than other treatments over the two seasons. The fertilised treatments at 114 kg K2O∙ha -1 that received water every 10 days had the smallest population of P. solenopsis in every season. Data during the two seasons (2021 and 2022) revealed that the maize to which potassium fertiliser was added by 114 kg K2O∙ha -1 and irrigated every 10 days had vegetative growth (plant height, diameter, and number of green leaves per plant), yield and its components (average ear length, ear weight, number of grains per ear, weight of 1000 grains, and grain yield) significantly increased as compared to those of the plants that were irrigated every 7 days and without adding fertiliser. A higher dose of potassium fertiliser reduces the infestation of P. solenopsis but causes an increment of maize vegetative growth. This affects the final yield. This information aids farmers in comprehending the good agronomic techniques of maize plants to decrease the infestation of mealybugs and increase the yield.
PL
Celem opracowania jest porównanie produktywności upraw rolnych, czyli wydajności jednostkowych w różnych systemach produkcji rolniczej oraz różnych uwarunkowaniach, jakie stwarzają doświadczenia przeprowadzone w warunkach polowych (zbliżonych do rzeczywistych w praktyce rolniczej). Wyniki badań mogą pozwolić wskazać czynniki i warunki jakie należy spełnić, by wydajności jednostkowe roślin uprawnych i sumaryczny wolumen produkcji rolniczej z jednostki powierzchni – niezależnie od systemu produkcji rolniczej – wykazywały jak najmniejsze różnice. Prezentowane dane obejmują wyniki doświadczeń polowych uzyskanych w pełnej rotacji płodozmianu w latach 2002-2006 oraz łącznie 10 lat (dwie rotacje doświadczeń, w latach 1997-2006).
EN
The research shows significant diversification in crop productivity depending on different agricultural regimes as well as respective years of the examined period. In the second round of research (2001 – 2006), the best aggregate results were achieved under the conventional regime, i.e. 61.9 of cereal units per hectare. The results under the integrated regime were 17% lower and under the organic regime, by as much as 33%. In the first round (1997 – 2001), the highest yield per hectare was achieved under the integrated regime, i.e. 49.9 of cereal units per hectare. Under the conventional regime, the yield was 6.2% lower and under the organic regime, it was 10.8% lower. Given the whole ten-year research period, the yield per hectare under the conven-tional regime amounted to 54.4 of cereal units per hectare, which was 6.8% higher than under the integrated regime and 21.0% higher compared to the organic regime.
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