STANDARDIZATION OF CROP GEOMETRY AND NITROGEN LEVELS FOR COMPACT COTTON GENOTYPE (Gossypium hirsutum L.) IN RAINFED VERTISOLS
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Date
2019
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Acharya N G Ranga Agricultural University, Guntur
Abstract
A field experiment was conducted on clay soils of Regional Agricultural Research Station Lam, Guntur to study “Standardization of crop geometry and nitrogen levels for compact cotton genotype (Gossypium hirsutum L.) in rainfed vertisols” during the year 2018 – 2019 under rainfed condition. The treatments consisted of three crop geometries S1 - 60cm × 10cm, S2- 75cm × 10cm, S3- 90cm × 45cm in combination with four nitrogen levels N1- 45kg N ha-1, N2- 90kg N ha-1, N3- 135kg N ha-1, N4- 180kg ha-1. The experiment was laid out in a randomized block design with factorial concept and replicated thrice.
Taller plants and maximum drymatter accumulation, functional leaves per square meter and leaf area index were recorded with closer crop geometry of 60cm × 10cm. However, number of sympodial branches per plant and sympodial length was highest with wider crop geometry 90cm × 45cm. All the growth parameters recorded maximum with application of 180Kg N ha-1 than all the other levels of nitrogen tested.
The crop geometry 60cm x 10cm recorded in maximum SCMR values and was significantly superior over rest of the crop geometry tested. Application of nitrogen 180Kg N ha-1 recorded maximum SCMR values. Number of bolls per square meter and seed cotton yield per ha-1 were recorded maximum with closer crop geometry of 60cm × 10cm. The number of bolls per square meter and boll weight were more with application of 180kg N ha-1. The maximum seed cotton yield was recorded with application of 135kg N ha-1 and was on a par with 180kg N ha-1.
The maximum uptake of nitrogen, phosphorus and potassium were recorded with closer crop geometry of 60cm × 10cm and with application of 180 kg N ha-1 followed by 135 kg N ha-1 than other crop geometry and nitrogen levels tested.
The maximum gross returns, net returns and return per rupee investment were obtained at closer crop geometry of 60cm × 10cm than all the other crop geometry tested. The highest net return and return per rupee investment recorded with nitrogen level of 135kg N ha-1, and was on par with 180 kg N ha-1.
Overall, the results showed that the spacing of 60cm × 10cm was found to be optimum to realize higher growth, seed cotton yield and net returns under high density planting system in the variety LHDP1. Increase in nitrogen application from 45kg N ha-1 to 180kg N ha-1 recorded higher growth and seed cotton yield and net returns. Application of 135kg N ha-1 was optimum for production of maximum seed cotton yield and net returns.
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D5943
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