Effect of planting dates on yield and quality of sugarcane (Saccharum species) varieties

Effect of planting dates on yield and quality of sugarcane (Saccharum species) varieties

Department of Agronomy, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttar Pradesh 263 145

Received. April 1992

In north and north-west India sugarcane February, mid-March, mid-April and mid- (Saccharum sp.) is usually planted in spring May) in the main plot and 4 varieties ('Co after harvest of wheat and gram. In north and 1148', 'CoS 802', 'CoS 767' and 'CoS north--west parts of country, delayed 7918') in the subplot. The soil was silty clay planting of sugarcane after rice--wheat loam, high in organic carbon (0.93%) and sequence causes reduction in yield and available potassium (262.8 kg Wha),

-quality. To select suitable variety and find medium in available phosphorus (19.6 kg C out optimum date of planting, a field Pha) and neutral in reaction (pH 7.3) experiment was conducted at Panmagar from February-planted crop gave the highest February 1987 to February 1988. cane yield and was significantly better than

The experiment was laid out in split-plot other planting dates. Delayed planting in design with 4 dates of planting (mid- March, April and May decreased cane yield

Table 1. Effect of planting date and variety on yield and quality of sugarcane

Treatment Cane Weight1 Millable Cane Brix Sucrose Purity Avail-Cower-length cane canes yield (%) (%) coef-able cia1 cane (cm) (s) ('000ha) (tonnesha) ficient sugar sugar (%) (tonnesha)

Planringdate .

Mid-Feb 226.2 901.0 93.8 86.9 19.2 15.9 83.0 10.6 9.3 Mid-Mar 206.4 757.9 83.7 71.3 18.8 15.9 84.6 10.7 7.6 Mid-Apr 182.2 728.9 71.5 56.1 18.4 14.5 77.9 9.3 5.2 Mid-May 155.5 563.6 58.6 38.2 17.6 13.7 77.7 8.9 3.4 CD (P = 0.05) 7.4 24.2 3.0 4.5 0.4 0.2 2.3 0.2 0.5

'Co 1 148' 190.6 689.4 79.3 64.6 19.5 16.1 82.4 10.7 6.9 ,'CoS 802' 188.0 730.9 73.3 60.6 17.8 14.2 79.1 9.2 5.7 'CoS 767' 184.3 713.5 73.9 57.9 18.4 14.8 80.7 9.8 5.8 'CoS7918' 207.4 817.6 81.1 69.5 18.4 14.9 81.1 9.9 7.0

CD (P= 0.05) 5.7 39.2 4.3 2.3 0.3 0.2 1.5 0.2 0.2

Part of M.Sc. Agriculture thesis submitted by the first author Present address: 'Directorate of Wheat Research, Karnal, Haryana 132 001

TRIPATHI AND PANDEY pol. 38, No. 2

by 17.9, 35.4 and 65.0% respectively compared with February planting due to decrease in yield components (Table 1). Among varieties, 'CoS 7918' gave the highest cane yield, being significantly higher than the other varieties. In general, 'CoS 79 18' showed its elastic behaviour with respect to dates of planting ranging from mid-February to mid-May .

February-planted crop followed by March-planted crop recorded maximum brix, sucrose, purity coefficient, available

sugar and commercial cane sugar and was significantly higher than May-planted crop. Commercial cane sugar produced by February- and March-planted crops were more than 2.5 and 2 times respectively than May-planted crop. Although, the value of above quality parameters was lower in 'CoS 7918' in comparison to standard variety 'Co 1148', increase in cane yield of the latter compensated and thus sugar 'yield was almost same in both varieties

Indian J. Agron. 38 (2) :340-341 (June 1993)

Performance of hybrid cotton (Gossypium species) cultivars at different plant densities and nitrogen levels under rainfed condition

J. K.JADHAO, A. M. DEGAONKAR AND W.N. NARKHEDE

Cotton Research Station, Marathwada Agricultural University, Nanded,

Maharashtra 431 601 -

Received: June 1992

Managing hybrid cotton (Grossypiumsp.) consisting of 4 plant densities (60 cm x for higher economic yield in black-cotton 30 cm, 60 cm x 60 cm, 60 cm x 90 cm and soils besides other factors, entails close co- 60 cm x 120 cm) and 4 nitrogen levels ordination of optimum plant stand and high (40, 60, 80 and 100 kg Nlha) as main fertility level. Due to luxurient growth, plots and 4 hybrids ('NHH 302', 'NHH 44', hybrids are still considered to be grown wide 'NHB 12' and 'DCH 32') as subplots apart. A field experiment was conducted were replicated twice in split-plot design. during the rainy (kharif) seasons of 1987, Sowing was done on 3 July, 22 June and 1988 and 1989 to determine the optimum 30 July in 1987, 1988 and 1989 respec- plant density and nitrogen requirement of tively. Half dose of N as per treatments 'NHH 302' cotton and it's yield potenital in and full dose (40 kgha) of F and K were comparison to estblished hybrids 'NHH 44' applied at the time of sowing. Remaining 'DCH 32' and' 'NHB 12' under rainfed half dose of N was applied at square-condition at Nanded. The treatments formation stage.