A field experiment was conducted on "Productivity and profitability of maize as influenced by genotypes, pacing and nutrient levels under irrigated situation" during the Kharif 2019 at Agriculture Research Station, Siruguppa, Karnataka, India. It is situated on the latitude of 15 o 38' N, longitude 76 o 54' E, 380 m elevation from MSL belongs to Northern Dry Zone (Zone 3) of Karnataka. The soil of the experimental site was medium deep black cotton soil with organic carbon content of 0.43 per cent, low in available N (226 kg ha -1 ), medium in available phosphorus (18 kg ha -1 ) and high in potassium (380 kg ha -1 ) content. Trail consisting 12 treatment combinations of 3 genotypes viz.V1: GPMH 1101, V2: GH 0727 and V3: RCRMH 4 in main plots, two spacing S1: 60cm x 20cm and S2:45cm X 20cm in sub plots and two nutrient levels F1:150:75:37.5 kg NPK/ha and F2: 225:112.5:56.5 kg NPK/ha in sub-sub plots laid out in split-split plot design and replicated three times. The experimental results revealed that, among the genotypes, RCRMH 4 recorded higher maize grain (8939 kg ha -1 ), stover yield (14167 kg ha -1 ) compared to other genotypes. Spacing did not influenced on grain and stover yield. Maize fertilized with 225:112.56.5 kg NPK/ha registered significantly superior grain (8085 kg/ha) and stover yield (13013 kg/ha) than lower dose. Similarly, maximum gross return (Rs. 140249/ha), net return (Rs.110651/ha) with B: C (4.75) was recorded in RCRMH 4 compared to other genotypes. Application of 225:112.5:56.5 kg NPK/ha gave higher gross, net returns and B: C of Rs. 126989 /ha, Rs. 96034/ha and 4.11, respectively than lower fertilizer dose. Similar trend in cob weight, 100 seed weight, cob length, cob girth, number of grain rows per cob and grain rows per cob were observed in RCRMH 4 and higher dose of fertilizer compared to rest of the genotypes and fertilizer level. But, spacing did not significantly influence on monetary returns.

No abstract

to study the productivity and profitability of cropping system as influenced by rice based cropping system in Tunga Bhadra Project area of Karnataka on deep black soil. The experiment consisted of ten cropping systems and laid out in completely randomized block design with three replications. The results showed that, growing of rice followed by ridge gourd (Kharifsummer) recorded significantly higher rice equivalent yield (11338 kg/ha), gross return (Rs.213355/ha), net return (Rs.142691/ha), BC ratio (3.08), system productivity (31.07 kg/ha/day) and system profitability (537.54 Rs/ha/day) compared to other cropping systems. Whereas rice followed by beans cropping system registered significantly lowest rice equivalent yield, gross returns, net returns, BC ratio, system productivity and system profitability when compared to other cropping systems tested under the study.

The long term experiment was conducted since 1987-88 on permanent site at Agricultural Research Station, Siruguppa, Karnataka to assess the effect of long-term nutrient management on productivity and soil fertility of maize (Zea mays)-wheat (Triticum aestivum) cropping system in Tungabhadra command area. The experimental treatments consisting 3 levels of nitrogen (40, 80 and 120 kg N/ha), 3 levels of phosphorus (0, 40 and 80 kg P2O5/ha) and 2 levels of potassium (0 and 40 kg K2O/ha) and with one absolute control, it was laid out in partially confounded design with 4 replications. The experiment was conducted in vertisols, which is slightly alkaline (8.12), low in soluble salts (0.36 dS/m), soil organic carbon (0.38), and available nitrogen (165 kg/ha) and medium in phosphorus (16.6 kg/ha) and rich in potassium (341 kg/ha). The maize was sown during kharif followed by wheat during rabi after harvest of the main crop in zero cultivation practice. The treatments were imposed as per the treatment combination. Maize hybrid NK 6240 and wheat variety DWR 162 were used in the trial. Experimental results revealed that maximum maize grain yield (4240 kg/ha), MEY (7291 kg/ha) and system productivity (19.97 kg/ha/day) were observed with application of 120 kg N/ha compared to 40 kg N/ha. Similarly, 80 kg P2O5/ha produced higher grain yield (4742 kg/ha), MEY (8420 kg/ha) and system productivity (23.07 kg/ha/day) and potassium application @ 40 kg/ha recorded higher grain yield (4244 kg/ha), MEY (6998/ha), system productivity (19.17 kg/ha/day) compared to lower levels of nutrients. In case of wheat, application of N @ 120 kg/ha, 80 kg P2O5/ha and 40 kg K2O/ha produced maximum yields (1861, 2243 and 1679 kg/ha, respectively) compared to their corresponding lower doses. Similar trend was also observed in 28 years mean data. Higher availability of N, P, K and S were observed in soil fertilized with higher level of N, P and K compared to lower doses.

No abstract