RESPONSE OF GARLIC (Allium sativum L.) TO LEVELS OF NITROGEN, PHOSPHORUS AND IRRIGATION INTERVAL

Simple item page
dc.contributor.authorMIKO, SANI
dc.date.accessioned2014-06-16T09:39:49Z
dc.date.available2014-06-16T09:39:49Z
dc.date.issued1999-05
dc.descriptionA dissertation submitted to the Postgraduate School, Ahmadu Bello University in partial fulfilLment of the requirements for the award of the degree of Doctor of Philosophy in Irrigation Agronomy. DEPARTMENT OF AGRONOMY FACULTY OF AGRICULTURE AHMADU BELLO UNIVERSITY ZARIA, NIGERIA MAY ,19 9 9en_US
dc.description.abstractField experiments to study the response of garlic (Allium sativum L.) crop to varying levels of nitrogen, phosphorus and irrigation interval were conducted during the 1994/95, 1995/96 and 1996/97 dry seasons (November to March) at the Institute for Agricultural Research, Irrigation farm, Samaru, Zaria (11° 11'N;07° 38'E 686m above sea level). The treatments consisted of four nitrogen levels (0, 75, 150 and 225KgN/ha), three levels of phosphorus (0,75, and 150KgP205/ha) and three irrigation intervals (5,10 and 15 days between irrigations). The experiments were conducted in a split-plot design with nitrogen levels and irrigation intervals forming the main treatments while the phosphorus levels were assigned to the sub-plots. The treatments were replicated three times in each season. Results obtained indicated that the application of 75KgN/ha produced significant increases in all growth and yield characters compared with control and higher rate of applied nitrogen had no further influence on these characters. Plots that received no nitrogen, however, produced significantly shorter plants, lower leaf number/plant, dry matter/plant and all yield components compared with the application of 75KgN/ha. Bulb yield and bulb phosphorus content were observed to increase significantly with increase in applied N only up to 75KgN/ha. The bulb crude protein content, however, was found to progressively and significantly increase with increasing rate of nitrogen up to 225KgN/ha. Increasing the level of phosphorus from 0 to 75KgP205/ha significantly increased plant height, dry matter/plant, number of leaves/plant, CGR and RGR in all the 3 experiments. Similarly, all other yield components responded significantly to applied phosphorus only upto 75KgP205/ha. Further, increase in applied phosphorus beyond 75KgP205/ha did not produce any appreciable increase. Similar trend was recorded on cured bulb yield/ha. The bulb phosphorus and protein contents also registered significant response to applied phosphorus only upto 75kgN/ha. Growth and yield characters as well as bulb yield, bulb phosphorus and crude protein contents were significantly decreased with increase in the number of days between irrigations but only upto 10-day irrigation interval, while further delay in irrigation to 15days between irrigations did not affect these characters appreciably. Generally, the 5-day irrigation interval significantly out yielded 10 and 15-day interval on all parameters assessed. Correlation analysis showed positive and significant associations between bulb yield and all characters assessed in all seasons, except in 1995/96 where insignificant associations were registered between bulb yield and average number of leaves/plant; a negative non-significant correlations between bulb yield and average clove weight. Dry matter/plant and average bulb weight had the highest direct individual contributions to bulb yield, while combinations of plant height and drymatter/plant (1995/96 trial) as well as bulb weight and bulb size (1994/96) were the highest contributors to bulb yield. Polynomial response of bulb yield to nitrogen, phosphorus and irrigation interval indicated quadratien_US
dc.identifier.urihttp://hdl.handle.net/123456789/4897
dc.language.isoenen_US
dc.subjectRESPONSE,en_US
dc.subjectGARLIC,en_US
dc.subject(Allium sativum L.),en_US
dc.subjectNITROGEN,en_US
dc.subjectPHOSPHORU,en_US
dc.subjectIRRIGATION,en_US
dc.subjectINTERVAL.en_US
dc.titleRESPONSE OF GARLIC (Allium sativum L.) TO LEVELS OF NITROGEN, PHOSPHORUS AND IRRIGATION INTERVALen_US
dc.typeThesisen_US
Files
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.58 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
AGRICULTURE