The Effect of passive solar heating system and of the kind of covering on yield and quality of melons cultivated in low tunnels

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1 The Effect passive solar heating system and kind covering on yield and quality melons cultivated in low tunnels Bouam M., Gerasopoulos D., Grafiadellis M. in Choukr-Allah R. (ed.). Protected cultivation in Mediterranean region Paris : CIHEAM / IAV Hassan II Cahiers Options Méditerranéennes; n pages Article available on line / Article disponible en ligne à l adresse : To cite this article / Pour citer cet article Bouam M., Gerasopoulos D., Grafiadellis M. The Effect passive solar heating system and kind covering on yield and quality melons cultivated in low tunnels. In : Choukr-Allah R. (ed.). Protected cultivation in Mediterranean region. Paris : CIHEAM / IAV Hassan II, p (Cahiers Options Méditerranéennes; n. 31)

2 ON EFFECT OF OF OF GER AS OP OU LOS^, m & Abstract: The effect using The minimum and maximum in unheated tunnels heated by to unheated ones in total melon yield was in low tunnels heated by passive system while by 10 days. The mean hit weight and length hit than and melon hits The tubes has to minimum by 2 to "C to maximum to 6.9 "C (Sallambas et al., 1989) and humidity by 6-12% al., 1990). Such a fail despite absence to adapt to is known that passive EVA film showed a 1-2 "C to melons has been achieved by use polyethylene 40 to 80 to visible light and minimum at night by 1 to 2 to weight, yield and ìn to in et al., 1989) in to an yield that muskmelon is a native it is easily damaged by all stages development. was also that that eating quality melons could be assessed by The aim to evaluate effect heating with on yield and quality melons vol31 145

3 altitude).the (5xlm) NE to SW at Chania (24O 02 E longitude, 35O 30 N latitude, 8 m with a in passive system (PSS), polyethylene sleeves (60cm sulphate tube to algae plus 10 g (Cucumis melo) CV. Antalya F1 29th in planting distances 50cm. The soil to and mulched with black as well as to sun set. dailyby middle tunnels (at about 30cm height). The at and peduncle, and change fiom to yellow). To quality, height, a 7.9 mm content (SSC - acidity (TA- loml juice with 0.01 N to 8.2) The analysis was table 1 it can that in all unheated maximum than 40 days on, (due to tubes) (Table 1). minimum cultivation time to 3 OC in to unheated tunnels. Tunnels highest minimum (Table 1). Excessive melon in low tunnels indicating need to low tunnel needs ventilation depending on is also that is by 2 to 4OC and is maximum by1.1 to 6.9 OC thus 1986; Sallambas et al., 1989). etal., (1989) that 2 tubes to 2OC. 146

4 Table 1: melons in PS -heatedandunheatedlowtunnelscoveredwithdifferent types plastics material Growth time ( C) k k k k k k k k k k k k f k k k k E k ~~ 30.7E2.Ö k k f f k t k k kO.8 9.7k k k k k kO k k kl.l 12.1-t k k k1.6 ( C) system). to non-heated ones (Table 2). Simple highest yield (41.6 kg) followed by EVA (35.2 kg), PE (34.7 kg) and 34.8 kg (Table 2). The peak fiom day 55 in fiuit 10 days 1). simple had mainly effected as well as fiuit weight melon in et al., (1989). that in fiuit weight and than Table 2: Quality characteristics and total yield melon fruit produced in PSS-heated and unheated low tunnels covered with different types plastics material VA weight (g) 953b 919b 941b 958b 106% 1 156a 1008a 1094a 108.5~ 109.5bc 108.1~ 111.7bac 117.4bac 118.8ba 121.la 114.7bac Length (mm) 109.5b 112.lba 110.7b 111.2ba 119.3ba 120.7a 120.8a 114ba (kg) 0.53b 0.58ba 0.58ba 0.57ba 0.62ba 0.74a 0.62ba 0.53b ssc (%) 9.9ba 9b 9.9ba 9.5ba 9.7ba 9.8ba 10.2a l Oa 6. la 5.9a 62a 6.2a 5.9a 6.la 6.la 6a Acidity 5.7a 5.9a 6. la 6a 5.7a 6. la 5.8a 5.8a Total yield 27.6~ 20.2bc 22.5~ 23.0~ 41.6a 34.7ba 35.2a 32.8ba a sandwiched EVA 147

5 25 -.c.l I O l O SPE U TPE n EUA TP3L /l - \\\ \ U N H EATED 5 i Time aftertransplanting (days) F igure 1. Production melons in kg during growing period in PSS-heated and unheated low tunnels covered with different plastic materials The in to amd had SSC, and ones (Table 2). and than et al. (1981) found that only to judge eating quality that quality fiom to by day length. that at SSC is 1971, Adams, 1975). The low tunnels heated with passive As a conclusion can be mentioned that is it minimum by 3 to 40C than such to to become 1 O vo

6 P., No T.W, G.W Esquira Sega1 and Antler A., C. von. Zabeltitz (ed.). Grafiadellis, ~ A. C., The (ed). Vol. 2. Academic London, pp ìn pp 1-53, England. A. and Verlodt Cullins melons (C. melo). J. and Blakeney, A.B., The objective definition eating quality in Nisen, A., Villele, O., Von Zabeltitz, Ch., P.F., Jimenez, A.A. and Verlodt, Book ppl-313. Photiades E., Yelboga, C. von. Zagdtitz (ed.). pp (69-79). Taieb, l?. And Grafíadellis,,1992. for in field in Winsor, G. W. and Adams, P., Changes in composition and quality tomato 149