Orange crop Nagpur mandarin Cultivation 4

 


Orange crop 

Irrigation Management


 Cap - 4

 

   Micro-irrigation systems in Orange crop  Nagpur mandarin and acid lime :


the Micro-irrigation system was standardized. Growth, soil moisture distribution, yield, and fruit quality of bearing Orange crop Nagpur mandarin was superior with Micro-jet 180 Degree (2/plant) and Micro-jet 300 Degree (2/plant) irrigation system in comparison with basin method of irrigation. Water use efficiency was more in micro-irrigation systems.



  Irrigation scheduling in Nagpur mandarin and acid lime :


Irrigation scheduling based on soil water with 20% and 30% depletion of Available Water Content and based on pan evaporation with 0.8 of open pan evaporation resulted better growth, yield and fruit quality of Nagpur mandarin and acid lime besides improving the water use efficiency.



  Fertigation in Nagpur mandarin and acid lime :


Standardized the NPK fertigation in Nagpur mandarin and acid lime. The fertilizer dose of 500 : 140 :70 (N:P:K) was developed for fertigation using water soluble fertilizers, which improved fertilizer efficiency.


  Mulching in Nagpur mandarin and acid lime :


Black polyethylene of 100microns and grass mulch @ 3 ton/ha. was found better in conserving the soil moisture, increasing the growth, yield and fruit quality in Nagpur mandarin and acid lime.


  Automatic drip irrigation scheduling :


The Nagpur mandarin yield was highest (30.91 t/ha.) with irrigation on alternate day 120 minutes three times followed by irrigation scheduled with 90 minutes interval two times daily (30.11 t/ha.).


   Micro-jet systems with controller :


The mandarin yield was highest with 1800 fan type micro-jet (2/plant) (29.34 t/ha.) followed by 3000 ray type micro-jet (2/plant) (26.22 t/ha.). The mandarin yield was highest i.e. 28.78 t/ha. with 4 lph eight emitters on single lateral in octagonal arrangement


  K- fertilizer fertigation :


The mandarin yield was highest (31.13 t/ha) with fertigation with Mono Potassium Phosphate (150 g K₂O/plant) followed by fertigation with Potassium Nitrate (150 g K₂O/plant) at 15 days interval (29.4 t/ha).


  K-fertigation dose standerdization :


The mandarin yield was highest (25.52 t/ha) with sulphate of potash (40 g K₂O/plant) fertigation followed by fertigation with 50 g K₂O/plant at 30 days interval (23.67t/ha).


  Critical growth stages and water requirements :


The critical stage of water requirement in Nagpur mandarin was found from January to June (Stage I (Jan-Feb), II(Mar-Apr) and III(May-June). The stage wise water requirement in Nagpur mandarin was optimum with 80 % ER in all the stages.


  Interaction of irrigation and fertigation levels :


The irrigation at 80 % evaporation replenishment ER and fertigation with 75 % RDF interaction gave higher yield in Nagpur mandarin.


  Micro-nutrients dose standerdization of zinc sulphate and iron sulphate :


The highest fruit yield per tree as well as fruit quality of Nagpur mandarin was observed in the fertigation of FeSO₄ @ 200 g/plant and ZnSO₄ @ 300 g/plant compared to soil application.

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