REAL -TIME NITROGEN MANAGEMENT THROUGH LCC AND SPAD METER IN RICE (Oryza sativa L.)
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Date
2010-06-30
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UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR
Abstract
A field experiment was conducted at Main Agricultural Research Station, Raichur during khariff, 2009, to study the real-time nitrogen management through LCC and SPAD meter in rice (Oryza sativa L.). There were twelve treatments comprising of five levels of LCC and five levels of SPAD meter and compared with recommended and farmers’ method of N application. Treatments were replicated three times in randomized complete block design.
Significantly higher grain yield per hectare was noticed with farmers’ method (44.53 q ha-1) of nitrogen application and it was on par with LCC 5 (42.40 q ha-1), LCC 5.5 (43.33 q ha-1), SPAD 37.5 (42.5 q ha-1), SPAD 40 (43.80 q ha-1) and recommended method (43.07 q ha-1) when compared to other methods of nitrogen application. The higher grain yield in rice was mainly attributed to higher yield attributes like number of panicles per hill, grains per panicle and test weight. The LCC 5, SPAD 37.5 and recommended method have recorded a higher agronomic efficiency (74.8, 69.7 & 41.9 %, respectively) and higher physiological efficiency (20.8, 22.8 & 13.6 per cent, respectively) over farmers’ method
The net returns were higher at LCC 5.0 and SPAD 37.5 and were comparable with recommended and farmers’ method benefit cost ratio. Increase in LCC levels from 3.5 to 5.0 increased the net returns to a tune of 52.27 per cent and further increase to 5.5 showed slight reduction in net returns due to increase cost of cultivation. Similarly increase in SPAD from 30 to 37.5 increased the net returns to a tune of 41.18 per cent and there was slight reduction at SPAD 40.
The study indicated that LCC value 5.0 and SPAD value 37.5 was optimum and it could be economically adopted in nitrogen management of rice.
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