Effect of nutrients and plant growth regulators on growth and yield of black gram in sandy loam soils of Cauvery new delta zone, India

Figures & data

Figure 1. Geographical location of the study area with the soil types observed in the district

Table 1. Characteristics of the study area

(a) Site characteristics
District	Thanjavur
Latitude and longitude	10° 08′N latitude and 78° 48′E longitude
Agro climatic zone	Cauvery delta zone (TN-4)
Elevation (above mean sea level, m)	59 (average elevation)
Mean annual rainfall (mm)	938
South west monsoon (mm)	329
North east monsoon (mm)	462
Winter rains (mm)	61
Summer rains (mm)	87
Major soils	Very deep red soils, followed by moderately deep black soils
Major crops grown	Rice, variety of pulses, banana, coconut, groundnut, sugarcane, and vegetables

(b) Soil characteristics of the experimental plot
Parameters	Content	Method
Texture	Sandy loam	Hydrometer (Day, 1965)
pH	7.25	Multiparameter instrument
EC (dSm^−1)	0.19
Available N (kg ha^−1)	81.2	Alkaline permanganate method (Subbiah & Asija, 1956)
Available P (kg ha^−1)	11.0	Olsen P method (Olsen, Cole, Watanable, & Bean, 1954)
Available K (kg ha^−1)	77.5	Ammonium acetate extractable K (Stannford & English, 1949)

Table 2. Effect of mono- and diammonium phosphate with growth regulators and micronutrient on growth parameters of black gram (mean data of two years)

Treatment	Plant height (cm)	Number of flower/plant	Number of pods/plant	Fruit setting (%)
T1	26.41	36.78	20.01	54.34
T2	27.66	41.10	23.11	56.18
T3	30.33	42.99	26.80	62.27
T4	28.87	43.05	25.29	58.64
T5	28.84	41.25	24.84	60.31
T6	35.30	50.69	34.66	68.37
T7	32.73	46.25	30.61	66.20
T8	35.93	51.15	35.87	70.06
T9	33.52	47.45	31.72	66.86
T10	37.62	50.12	37.15	72.55
T11	35.96	48.89	35.64	70.75
SEd	0.77	0.85	1.06	1.16
CD (p = 0.05)	1.62	1.76	2.25	2.44

Figure 2. Influence of foliar spray of macro-, micronutrient and growth regulators on grain and haulm yield of black gram (mean data of two years)

Figure 3. Influence of foliar spray of macro-, micronutrient and growth regulators on benefit cost ratio of black gram (mean data of two years)

Figure 4. Regression analysis of plant height and number of flowers versus grain yield

Figure 5. Regression analysis of number of pods and fruit setting percent versus grain yield

Day, P. R. (1965). Particle fractionation and particle-size analysis. In C. A. Black (Ed.), Methods of soil analysis, Part 1: Physical and mineralogical properties (pp. 549–567). Madison, WI: SSSA and ASA.

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Stanford, G. , & English, L. (1949). Use of flame photometer in rapid soil test for K and Ca. Agronomy Journal , 41 , 446–447.

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