The Long-Term Permanent Plot Experiments in Israel
This publication published by IPI and IFA is a report of two long-term fertilization experiments (LTFE) which were established in Israel in 1961 by the Volcani Institute of Agricultural Research to provide a scientific basis to support the transition from rain-fed to irrigation-fed agriculture that was occurring in many parts of the country. The objectives of the experiments were to develop and test new fertilization regimes under controlled irrigation conditions in semi-arid and arid climates; to adopt new cash crops grown under irrigation and to study their short and long-term response to fertilizer and manure application rates; and to improve and calibrate soil tests for evaluating nutrients’ availability to plants. The first LTFE was established in central Israel at Bet Dagan experimental station, representing semi-arid growth conditions (400-500 mm winter rain), deep alluvial soils, and mechanically-harvested field crops. The second LTFE was founded in southern Israel at the Gilat experimental station, representing arid growth conditions (200-300 mm winter rain), loessial soils, and small farm vegetable crops. The experiments continued until 1993 at Bet Dagan and 1994 at Gilat. The crops grown at Bet Dagan included cotton (grown 11 times), wheat (8), corn (2) and sugar beet (2); and, at Gilat, potato (3 times), Chinese cabbage (3), cucumber (3), onion (3), and carrot (2).
The results in both experiments are presented chronologically. For each year, all the obtained crop, soil and meteorological data are compiled according to treatments in uniform Excel files which are accessible to readers. In addition, a graph or table summarizing the crop response to the main treatments or resulting soil factors are included in the main text. Over the years all of the important crops grown in Israel were characterized with respect to their yield response to nitrogen (N) application rate in relation to phosphorus (P) and potassium (K) status in soil.
The evaluated long-term effects include fertilizer and manure application rate effects on soil fertility, fertilizer use efficiency, leaching of nitrate and chlorides to underground water, crop yield, and N uptake response to available P and K soil concentrations.
The report includes the main conclusions from these experiments.
The pdf of the publication contains individual hyperlinks to the original data files on the IPI website. These links are to individual Excel spreadsheet files.
In addition, we have also provided (as a separate download) the entire collection of Excel spreadsheets in a zip archive (approx 3MB), making the documents available offline.
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