Yield forecast model for small cardamom (Elettaria cardamomum Maton)

Srinivasan, K.; Senthilkumar, P.; Menon, P.P.; Krishnakumar, V.; Potty, S.N.

Proceedings of the 15th Plantation Crops Symposium Placrosym XV, Mysore, India, 10-13 December 2002: 310-316

2002


Accession: 013610034

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Abstract
In order to evolve a suitable foliar analytical technique for optimising the yield levels of small cardamom (Elettaria cardamomum Maton), studies were conducted in two phases. The first phase of the studies was a sand culture experiment aimed at identifying a suitable tissue which would be sensitive to the nutrient levels in the soil and could express the nutritional variation in the plant system. In this experiment, Hoagland solution of concentrations 0.25 N, 0.50 N, 1.0 N, 2.0 N and 3.0 N (N indicating the strength of the Hoagland solution), was applied to six months old cardamom seedlings and the application was repeated twice a week. The experiment was conducted for a period of twelve months. Various plant parts such as leaves, stems, rhizomes and roots were collected, processed and analysed for plant nutrients. The results of analysis indicated that only the leaves of the young growing tillers expressed variation in nutrient status in relation to the application. In the second phase of the studies, a 33 factorial experiment was laid out using tissue culture cardamom plants. Nitrogen was applied at the levels of 0, 40 and 80 Kg/ha, phosphorus @ 0, 80 and 160 Kg/ha and potassium @ 0, 40 and 80 Kg/ha. Biometric observations on the number of buds, young tillers, bearing tillers, panicles and racemes and data on yield were recorded every crop season and analysed. Based on the outcome of the first phase of the studies, leaves of young tillers were collected, processed and analysed for plant nutrients (N, P, K, Ca and Mg). Multiple regression analysis of the leaf nutrients with yield was made and it was observed that only the second leaf (from top) showed significant correlation with yield. An yield forecast model, incorporating the effect of eleven independent variable with yield as the dependent variable was, thus, evolved as given below:- Y (Yield gm/plant): -72820.31+28450 N+297020 P+15998 K+1459.1 Ca+5941.8 Mg -115820 NP-69755 PK-6237.9 NK -534.8 NCa-2329.3 NMg+27179 NPK. The evolved model, exhibiting a precision of 65.6%, can be used for assessing the current level of cardamom production on the basis of leaf nutrient status.