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ABSTRACT BALBAS, CHRISTIAN BUTCH ANDREW A. Mariano Marcos State University, Graduate School, August 2021. IMPROVING GARLIC (Allium sativum L) PRODUCTIVITY THROUGH THE ALTERATIONS OF PLANTING DISTANCE AND NUTRIENT MANAGEMENT AS AFFECTED BY CARAGEENAN PLANT GROWTH PROMOTER. Major Adviser: Dionisio S. Bucao, PhD Garlic (Allium sativum L.) which belongs to the family Amaryllidaceae is one of the most economically vital high value crops in the country. The average volume of garlic production in the Philippines from 2017-2019 is about 7,522.16 metric tons wherein Ilocos Region shares about 66.06% which is primarily produced in Ilocos Norte (93.67%). The demand for garlic, based on PSA, is 120 MT (PSA 2020). However, the area that are being planted by garlic is decreasing. The Ilocos Region is the highest garlic producing region, but has the lowest average yield per unit area planted. the The study was conducted to: 1) to determine the performance of garlic as affected by planting distance; 2) to assess the performance of garlic using different nutrient show management as affected by carrageenan plant growth regulator; 3) to interaction effect between planting distance and nutrient management as affected by carrageenan plant growth regulator; and 4) to compute for the cost and return of garlic as affected by alterations of planting distance and nutrient management as affected by carrageenan plant growth regulator. Fertilizer had a substantial effect on plant height at 45 DAP. At 60 DAP, there were highly significant effects in planting distance, fertilizer, and their interactions, as well as CPGR. There was no significant influence on CPGR at 75 DAP, but there were highly significant effects in planting distance and fertilizer, as well as a substantial effect in the interaction of CPGR and fertilizer. At 30 DAP, it was discovered that the varied treatments had no significant effect on the number of leaves. Planting distance had a substantial impact on the number of leaves at 45 DAP. At 60 DAP, there was a significantly substantial effect on CPGR and fertilizer. Also at 75 DAP, highly significant ere observed on fertilizer and a significant effect was observed on PGR, differences likewise a significant interaction effect was observed between CPGR and fertilizer, planting distance and fertilizer and the interaction of CPGR, planting distance and fertilizer. On the laminar width, significant differences were observed on the interaction of planting distance and fertilizer, and between CPGR, planting distance and fertilizer at 60 DAP. While at 45 and 75 DAP, there was no significant effect of the treatments on the laminar width. The ANOVA test results indicate that for bulb weight, bulb diameter, bulb length, and crop cut, there were a highly significant differences on CPGR, planting distance, fertilizer and the interaction effects, while fertilizer only had a significant effect on the number of cloves. Based on the Chi-Square test of independence, the incidence of tangle top were dependent on the application of CPGR, planting distance and fertilizer applied. Colder microclimate decreases soil moisture evaporation which is favorable to garlic growth and development and 10x15 obtained the coldest temperature on all observation periods. |