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Outstanding Research - Page 3

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  • 15. Effect of saline water irrigation on soil and quality of grapes
    Four vineyards in Nashik division having highly saline water as source of irrigation were selected. The water, soil and petiole samples from each garden were analysed by adopting standard methods. Considering the total salts in the irrigation water it was found that all the sources were harmful for proper growth of grapevines. In connection was highest in vineyard No. 4. Hazordous salts viz, sodium and chloride were also found to be highest (17.68 & 19.40 mcl) in water used for vineyard no. 4, followed by the water for vineyard no. 3. The movement to divalent ratio (kelley's ratio) also followed the same trend. The ca/p and k/p ratios in soil, petiole of skin were found in vineyard 3 & 4, thereby showing low concentration of phosphorus. Low acidity (0.68 g/100 g), higher TSS (23%) & high anthocyanins (0.116) were observed in comparison to garden 4, where the incidence of Pink berry formation was maximum to the tune of 80%.
  • 16.Use of biological insecticides for the control of thrips.
    Studies were undertaken to see the effect of some of the biological insecticides on control of thrips at Manjari Farm, Pune. Azadiractin 50,000 ppm & 30% oil based were used at 30 ml/ 100 liters of water. It was observed that in the grape vines were Azadiractin was sprayed at an interval of every 3 days, the control of thrips after three sprayings was 7.84% which later reduced to 0% after 4th spraying. Where cow urine was sprayed at an interval of every three days, thrips population reduced from 5.29% to 0.09% after 5th spray.
  • 17.Survey of grape disorders in Maharashtra.
    • 1.Pink berries :
      Pink colour development in the skin of non pigmented cultivar of Thompson Seedless and its mutant viz, Tas-A-Ganesh, Sonaka, Manik Chaman was observed since last decode, resulting in flaccid berries with bitter taste, which are inferior for raisin making & for processing & result in loss of 80 -100 crores per annum.
      It was logically thought that antiethylene & ABA group of hormones viz, auxins delay ripening & regulate pink color formation. Observations recorded attributed 2 CEPA & ABA for an increase in pink berry formation.
      Any nutrient could not be targeted for pink berry formation, but needless use of calcium & M excess resulted in pink berry formation. High potassium in the skin may also aggravate pink berry formation.
    • 2.Stalk necrosis / pedicel girdling / water berries :
      All the three disorders are late season maturity disorders related to each other, finally resulting in scattered water berries in the bunch causing severe losses. Imbalances in nutrients like Nitrogen, Potassium, Calcium and Magnesium leads to these disorders.
    • 3.Sun Scorching:
      This is the major disorder observed during veraison causing considerable losses to growers. Excessive use of CPPU, Brassinostreoids and other potent PGR's are responsible for total collapses of bunch due to burning of tissues by sunrays and PGR'. Heavy incidences of thrips also result in scorching. Color forming pigments like chlorophyll, anthocyanins, carotenoids are affected due to sun rays, resulting in basic changes in composition of berry skin focus on flavanol content of berries during and after veraison needs to done.
      Overall a systematic research trials on various disorders is required to come to a final conclusion and thereby suggest appropriate control measures. {gallery}research{/gallery}
  • 18.Effect of Forchlorfenurn (CPPU) on berry development.
    A field trial was conducted in vineyard at Narayangaon in 2005 – 06 using Tas – A – Ganesh as test variety. Highest mean berry development and weight were recorded by application of GA3 30 ppm + CPPU 2 ppm. Berry development in respect to size, weight, length was significantly superior over control, indicating that CPPU acts sypergistically with GA3 in improving berry development.
  • 19.Ferility status and nutrient indices of grape growing regions of Maharashtra.
    9329 soil samples were collected from Nashik, Pune, Sangli, Solapur region and analysed for nutrient status. The average fertility of these was then computed.
    It is revealed from the nutrient indices that the soils of Nashik region were deficit in organic carbon. Soils from Nashik, Pune & Solapur region were found to be deficit in available N content with fertility index less than 1.50. Nutrient index of all four regions was in the range 1.50 to 2.50 showing sufficiency of phosphorus, potassium, Sulphate, Iron, Manganese & Zinc. In case of calcium, magnesium and copper the nutrient indices were more than 2.50 indicating their high concentration.
  • 20.Nodaltileges and Berry Stalk necrosis disorder in grapevine and solutions – A success story.
    Vineyards from Haveli Tahsil, Pune was selected. It was found that total Nitrogen and Magnesium content in rachis and pedicel are mainly responsible for the disorder. Total Nitrogen in rachis and in pedicel was very high in affected bunches over the non affected ones. The magnesium content is very low in both affected and unaffected rachis as well as in pedicel. Visual symptoms of Boron deficiency were also noticed and hence Boron application through foliar sprays was recommended. The growers were advised two sprays of magnesium Sulphate and Boric acid within a period of 8 days and one spray of sodium molybdate in the same period.