Effect of dose and time application of phosphorus fertilizer on phosphorus availability, growth and production of rice (Oryza sativa l.)

Abstract

The use of fertilizer as a supporting factor for plant growth continues to increase, but it is not directly proportional to the increase in plant growth, so some efforts are needed to improve fertilizer efficiency, among others, by paying attention to the right dosage and time application. The objective of this research to study the right application time and dosage of phosphorus fertilizer to increase the availability of phosphorus nutrients, growth and rice production. The research was carried out in the rice fields of Namoukur village, Sei Bingai District, Langkat Regency in September 2019 to December 2019. The research used a non factorial randomized block design with 6 levels of treatment, consist of: control; application SP-36 at planting with a dose of 141\u2005kg / Ha (100%); application SP-36 at 5 days after planting with a dose of 141\u2005kg / Ha (100%); application SP-36 at 5 days after planting with a dose of 70.5\u2005kg / Ha (50%) and application 25 days after planting with a dose of 70.5\u2005kg / Ha (50%); application SP-36 at 5 days after planting with a dose of 70.5\u2005kg / Ha (50%), application 25 days after planting with a dose of 35.25\u2005kg / Ha (25%) and application 45 days after planting with a dose of 35.25\u2005kg / Ha (25%); application SP-36 at 5 days after planting with a dose of 70.5\u2005kg / Ha (50%) and application 45 days after planting with a dose of 70.5\u2005kg / Ha (50%). Application SP-36 at 5 days after planting with a dose of 70.5\u2005kg / Ha (50%) and application at 25 days after planting with a dose of 70.5\u2005kg / Ha (50%) was significantly affected the weight parameter of soil P nutrient at age 35 and 55 days after planting, grains per panicle and 1000 grains weight. Application SP-36 at 5 days after planting with a dose of 70.5\u2005kg / Ha (50%) and application 25 days after planting with a dose of 70.5\u2005kg / Ha (50%) also was the highest mean on plant height parameters and soil P nutrient availability at age 75 days after planting, while the highest number of tillers was found in application SP-36 at 5 days after planting with a dose of 70.5\u2005kg / Ha (50%) and application 45 days after planting with a dose of 70.5\u2005kg / Ha (50%), on the leaf P nutrient analysis parameters and the highest P nutrient uptake was found in application 5 days after planting with a dose of 70.5\u2005kg / Ha (50%), application 25 days after planting with a dose of 35.25\u2005kg / Ha (25%) and application 45 days after planting with a dose of 35.25\u2005kg / Ha (25%)