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Advisor: Murtaza Hasan
Title: Studies on Potassium Dynamics and Fertigation Scheduling for Kinnow
Other Titles: M Sc
Publisher: IARI, Division of Agricultural Engineering
Type: Thesis
Agrotags: irrigation, fertigation, fruits, potassium, yields, fertilizers, crops, nutrients, trickle irrigation, marketing
Abstract: Kinnow (Citrus reticulata Blanco), a hybrid of King and Willow leaf mandarin, is a rich source of Vit-C and commercially important fruit crop in India. The cultivar holds a unique position among all varieties of citrus due to its economic earnings in the country. In recent years Kinnow has become the most favourable cultivar among citrus growers in Northern India and at the same time drip irrigation has gained popularity among the citrus growers. However citrus growers are unaware about the quantity of water and fertilizers to be applied to citrus crops at different growth stages under drip fertigation. Field experiments were carried out at the farm of Centre for protected cultivation Technology, Indian Agricultural Research Institute, New Delhi during 2010 and 2011 to study the effect of different levels of fertigation on fruit yield and quality parameter of kinnow and dynamics of water and potassium under drip fertigation using Hydrus 2D model. The experiment consisted of nine treatments with three levels of irrigation amount i.e 60, 80 and 100% of ETc and three levels of potassium fertilizer i.e 600 g K/plant/year (F1), 700 g K/plant/year (F2) and 800 g K/plant/year (F3). The maximum yield (32.67 t/ha) was observed at 80% of ETc and 700 g/plant/year K followed by 100% of ETc and 800 g/plant/year K (32.18 t/ha). Minimum yield was obtained with 60% of ETc and 600 g/plant/year K (19.79 t/ha).The maximum TSS (12.03 %) and fruit juice content (46.8%) were found under 80% of ETc and 700 g/plant/year K and 100% of ETc and 800 g/plant/year K treatments and minimum under 60% of ETc and 700 g K/plant/year and 60% of ETc and 800 g plant/year K treatment respectively. The treatments with 60% ETc were different from 80 and 100%, however 80% and 100% ETc treatments had same effect on yield, TSS and juice content. Water and potassium dynamics in the root zone of kinnow crop were simulated for T5 (80% ETc and 800 g/plant/year K) treatment as highest yield was obtained under this treatment. The field data for observed water content and potassium were collected at 24, 48 and 72 h after fertigation to calibrate the Hydrus 2D model. The simulation results for sandy loam soil showed that moisture content in the active root zone was near to field capacity at 24 and 48 hrs after irrigation but there was decline in moisture content after 72 hrs. The irrigation frequency was 72 hrs which indicated that moisture was readily available in the active root zone of the kinnow plants and was ideal for healthy crop growth. Potassium concentration at 24, 48 and 72 h after fertigation was found higher in upper layer of soil (15-30 cm) and lower in deeper layer (45-60 cm). From the simulation studies it was revealed that 4 lph dripper optimised the potassium concentration between depth of 15-30 cm. So results clearly indicated that potassium was efficiently utilized with 4 lph dripper, as the active root zone (highest root density) of the kinnow was found between 15-30 cm depth. Results indicated that 4 lph dripper was the optimum discharge size for potassium fertigation in sandy loam soils. Based on the experiment conducted to study the effect of different levels of Fertigation on fruit yield and quality parameters, the treatment with 80% ETc and 700 g K/plant/year of was chosen as optimum dosage to increase the yield and quality of kinnow fruits. This study helped in choosing the optimum dosage of water and fertilizer which was used for developing an optimal fertigation schedule for kinnow plants. The fertigation schedule involved month wise application of number of irrigations and application of the fertilizer dosage based on different crop growth stages of kinnow
Description: T-8444
Issue Date: 2011
Appears in Collections:Theses

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