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Study on fertigation scheduling in Kinnow mandarin

KrishiKosh

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Title Study on fertigation scheduling in Kinnow mandarin
 
Creator UWISIZE MARIE GRACE
 
Contributor V.B. Patel
 
Subject ---
 
Description T-8524
A field experiment was conducted on Kinnow mandarin to find out effect of
fertigation on growth, physiological and biochemical parameters, nutrient status in soil and
leaf, yield and fruit quality. The treatments were T1: Ring irrigation with standard N, P, K as
soil application; T2: Drip with 100 per cent N, P, K as soil application; T3: Fertigation with
100 per cent N and P, K as soil application; T4: Fertigation with 75 per cent N and P, K as soil
application; T5: Fertigation with 50 per cent N and P, K as soil application; T6: Fertigation
with 100 per cent N, P, K; T7: Fertigation with 75 per cent N and 100 per cent P, K
fertigation and T8: Fertigation with 75 per cent N, P, K. The experiment was conducted on 5-
year-old plants at Todapur Orchard, IARI, New Delhi during 2010-11. Fertigation had
significant effect on vegetative growth parameters of trees over drip and ring irrigation
systems or soil application. Fertigation with 100 per cent N, P, K (T6) had positive effects in
improving photosynthetic rate (8.49 μmol m-2s-1), transpiration rate (0.77 μmol m-2s-1),
stomata conductance (0.34 μmol m-2s-1) and relative water content (94.54%) compared to
other treatments. Higher chlorophyll content (2.01 mg g-1 FW), carotenoids (1.84 mg g-1 FW)
and total leaf sugars (48.30 mg g-1 FW) were recorded in fertigated plants compared to soil
application of fertilisers. The maximum number of fruits per tree (160) and yield (12.08 t/ha)
was recorded under fertigation with T6; however it did not influence the fruit weight
significantly. Fertigation had no significant effect on number of seeds per fruit. The maximum
juice content (48.59%), TSS (9.46 0Brix), acidity (0.94%), ascorbic acid (45.03 mg/100 ml of
juice) and total sugars (8.20%) contents were found under fertigation with T6. While, higher
TSS: acid ratio (11.48) was recorded with treatment having ring method of irrigation and soil
application of fertilizers, while reducing sugars with fertigation with 50 per cent N and P, K
as soil application. Fertigation treatments resulted in significant variation in leaf nutrient
content in the leaves of Kinnow during the both sampling intervals. Higher nitrogen (2.85%),
phosphorus (0.17%), manganese (61.33 ppm) and copper (14.85 ppm) were recorded with
fertigation with 100 per cent N, P, K, while higher potassium (1.84%) and zinc (64.83 ppm)
was in leaves of the plants fertigation with 50 per cent N and 100 per cent P, K as soil
application. There was no significant effect of fertigation on leaf iron content during both
sampling stages. Available nitrogen, phosphorus and potash distribution in soil had shown a
decreasing trend with increasing soil depths (0-15 to 30-60 cm) regardless of the treatments.
Fertigation resulted in increase in concentrations of both macro and micro nutrients near the
active root zone (0-15 and 15-30 cm depths), exhibiting a radial decrease with increasing
horizontal distance from the point of application, i.e. higher at 50 cm and lower at 100 cm
distance from the trunk. The fertigation with higher amount of fertilizers retained in the soil at
the harvest were found in ring irrigation with soil application compared to fertigation
treatment. Hence, fertigation with 75 per cent N and 100 per cent P & K (450g N, 300g P and
400 g K) can be recommended for application in three splits during February
(225N:75P:100K), Apri1(112.5N: 112.5P: 150 K) and August (112.5N: 112.5P: 150 K) for
young Kinnow orchards.
 
Date 2016-12-02T09:37:55Z
2016-12-02T09:37:55Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/88793
 
Format application/pdf
 
Publisher IARI, DIVISION OF FRUITS AND HORTICULTURAL TECHNOLOGY