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• 18

  Dec
  Examination of autumn melon varieties

  Vegetables

  by Yoram Zvieli

  תחום או ענף ירקות
  תאריך עדכון 19/2/2008

  תיאור מלא In an experiment conducted by Arava R&D in a commercial field of Zeira farm in Neot Hakikar, 26 varieties of Galia-type and orange-colored peel (Cantaloupe, Charantais) types were studied in an experiment (four replicates) or an observation (two reps). Planting took place on 20/9/05 and harvest was carried out on weeks 47 to 51, starting on 20/11/05 (61 days after planting), and ending on 14/12/05 with eight picking sessions.
  Galia-type varieties testing the experiment: average total yield: 4.9 kg/m2. Average exportable yield: 3.9 kg/m2. Varieties '2161' and '7506' excelled in yield and quality.
  Among Galia-type varieties under observation: var. '6025' excelled with 5.4 kg/m2 and 87% exportable fruits, but it has a tendency to have brown spot on peel – a negative trait in the market. Var. '1625' excelled in high rate of large exportable fruits, but it had relatively low sweetness. Var. '7506' was the earliest to ripe, and var. '7507' was the latest.
  Cantaloupe varieties testing the experiment: var. Magritte (5131) did better than var. Magnet (3101), with total yield of 4.1 kg/m2, of which 89% exportable. Vars '96201' and Derby had better fruit quality than var. Magritte, but their yield was smaller.
  In conclusion, it is recommended to test again the following varieties: '2161' (Semco), '7506' (Yam Tichon Zeraim), and '6025' (Hazera), in comparison to the commercial varieties '7303', '1537' (Trooper), and '1625'.

  שפה English
  מחבר Yoram Zvieli, Rivka Offenbach, Ami Maduel, Rami Golan, Israel Zabari, Eviatar Itiel, Shimshon Omer, Ami Zeira
  שנה 2007
  שייכות Israel Tsabari
  תאריך יצירה 19/2/2008
  תאריך עדכון 19/2/2008
• 18

  Dec
  Using Restricted Root Zone (RRZ) as a preventive measure against Meloidogyne

  Vegetables

  by Eviatar Ityel

  Using Restricted Root Zone (RRZ) as a preventive measure against Meloidogyne
  תאריך עדכון 19/2/2008

  תיאור מלא Tomato varieties 5656 and 3057 were planted in Zohar experimental station on 3/3/05 in soil infested with Meloidogyne javanica nematodes. Sanitization with methyl-bromide using the hot gas method totally prevented infection with the nematode. High infection rates were found in the control plots (370 larvae per 50g of soil), which caused a significant delay in plants growth. In the RRZ plots, the Palrig sheet, used to separate between the local soil and the root zone, restricted and even prevented the penetration of nematodes from the infested soil to the RRZ volume. The use of the RRZ method for tomatoes or other vegetables has a potential for reducing, or even preventing, infection with nematodes in contaminated soils. The probability of nematodes penetration may be further reduced by mulching.

  שפה English
  מחבר Eviatar Itiel, Ami Maduel, Dorit Hashmonai, Rivka Offenbach, Shimon Fibonia, Rachel Levita, Yoji Oka
  שנה 2007
  שייכות Israel Tsabari
  תאריך יצירה 19/2/2008
  תאריך עדכון 19/2/2008

  OPEN
• 17

  Dec
  Salinity leaching requirements A case study for bell pepper

  Vegetables, Soil and Water

  by ALON BEN-GAL

  תחום או ענף אגרוטכנולוגיה; ירקות
  תאריך עדכון 23/4/2008

  תיאור מלא Maximization of crop yields when the salinity of irrigation water is high depends on providing plant transpiration needs and evaporative losses, as well as on maintaining minimum soil solution salinity through leaching. The effect of the amount of applied irrigation water was studied regarding transpiration, yields, and leaching fractions as a function of irrigation water salinity. Bell pepper (Capsicum annum L. vars. Celica and 7187) in protected growing environments in the Arava Valley of Israel was used as a case-study crop to analyze water quantity-salinity interactions in a series of lysimeter, field and model simulation experiments. Leaching fraction was found to be highly influenced by plant feedback, as transpiration depended on root zone salinity. Increased application of saline irrigation water led to increased transpiration and yields. The higher the salinity level, the greater the relative benefit from increased leaching. The extent of leaching needed to maximize yields when irrigating with saline water may make such practice highly unsustainable.

  שפה English
  מחבר Alon Ben-Gal, Eviatar Ityel, Lynn Dudley, Shabtai Cohen, Uri Yermiyahu, Eugene Presnov, Leah Zigmond, Uri Shani
  שנה 2008
  שייכות yzvieli
  תאריך יצירה 23/4/2008
  תאריך עדכון 14/3/2012

  OPEN
• 17

  Dec
  USE OF TENSIOMETER IN PEPPER CULTIVATION IN THE ARAVA VALLEY

  Soil and Water, Vegetables

  by Shlomo Kramer

  תאריך עדכון 15/5/2008

  תיאור מלא The operation of irrigation systems according to the changing soil water potential may suggest a regime that follows the physiological state of the crop, thus being more accurate and water saving. A sensor, which represents the soil water content on-line, may provide the data required for automatic update of the irrigation program. An experiment was executed during the 2006/7 season in a sweet pepper greenhouse in Paran (Zer farm) in order to test the effects of the applied water quantity when irrigation signal comes from the tensiometer ,on the irrigation frequency, plant development and yield, and on the seasonal water consumption. Three independent treatments were examined, were the amounts of 2, 3, and 4 mm (L/m2) were applied upon a signal. In order to learn the crop response to irrigation amounts, two additional treatments were operated according to the sensor of the 3 mm treatment (dependent), in one 2mm were applied and in the second 4 mm.
  The average daily quantity of irrigation water had a significant effect on the plant height already at the beginning of October, two weeks after the treatments had been administered; plants receiving the least quantity, 2 mm while the other were getting 3 mm and more, were remarkably shorter than the others. The effect on the yield was obvious on early February, when the 2 mm treatment obtained only 5.6 as compared to the 6.5 kg/m2 obtained by the others and the difference remained as such to the end of the season. In the independent treatments, the average daily water quantities were equal from late November, gradually declining to a level of 1-1.5 mm on late January. The irrigation frequency was the lowest at the 4 mm, and the highest at the 2 mm treatment. Measurements of the soil extracts indicated on mid January nitrogen depletion at the two treatments of 2 mm per pulse. No indication for any increase in soil solution EC at the rhizosphere (10-15 cm deep) was found.In Soil samples taken on 18/01/07 the Chloride concentration at the layer 0-15 cm was higher in the 2 mm dependent treatment.
  Our results demonstrate that the operation of an irrigation system upon a signal of a soil-moisture sensor is feasible and allows for an efficient and appropriate management of the irrigation regime. The method, whenever adopted by the growers, will surely bring about significant water saving, as related to the present irrigation habits. Notably, however, is the fact that an average daily water quantity smaller than 3 mm from mid September to mid December has slowed down the plant growth rate and has brought about a yield decrease.

  שפה English
  מחבר Shlomo Kramer, Israel Zer, Elisha Kenig
  שנה 2008
  שייכות yzvieli
  תאריך יצירה 15/5/2008
  תאריך עדכון 14/3/2012

  OPEN