Biometric observations of upland rice (Oryza sativa L.) as influenced by NK ratios and time of sowing

Abstract

An experiment was conducted at College of Agriculture, Vellayani, Thiruvananthapuram, Kerala Agricultural University, Kerala, India. The treatments were laid out in factorial randomized block design. Different NK ratios (60:30, 120:60, 120:90, 140:70 and 140:105) and two time of sowing (one week after the commencement of SW monsoon, 2019 and two weeks after the commencement of SW monsoon, 2019) were studied and evaluated statistically on growth characters like plant height (30 DAS, 60 DAS and at harvest), number of tillers m-2 (60 DAS) leaf area index (60 DAS) and dry matter production (60 DAS and at harvest). The results revealed that there is significant difference in biometric observations. The treatment l6 (140:105 kg ha-1 of NK at 2:1.5 ratio) recorded the maximum plant height (99.23 cm), highest number of tillers m-2 (378.83) and dry matter production (5073 kg ha-1). Regarding time of sowing, s1 (sowing one week after the commencement of S-W monsoon, 2019) produced the tallest plants (96.77 cm), highest number of tillers m-2 (345.00) and dry matter production (4618 kg ha-1). Among the treatment combinations, l6s1 (140:105 kg ha-1 of NK at 2:1.5 ratio and time of sowing one week after the commencement of S-W monsoon, 2019) produced the tallest plants (101.70 cm), highest number of tillers m-2 (415.67) and the maximum dry matter production (5256 kg ha-1).