+ Translate

Trends in irrigated rice yields under intensive cropping at philippine research stations

, : Trends in irrigated rice yields under intensive cropping at philippine research stations. Field Crops Research 9(1): 1-16

Trends in rice yields were estimated from N-response experiments conducted at 4 locations in the Philippines-Maligaya Rice Research and Training Center (MRRTC), Bicol Rice and Corn Experiment Station (BRCES), Visayas Rice Experiment Station (VRES) and IRRI [International Rice Research Institute]. The largest dry-season decline in yield of 'IR8' occurred at IRRI, where yields fell by .apprx. 0.3 t ha-1 yr-1. IR8 yields in the same season fell by slightly > 0.1 t ha-1 yr-1 at BRCES, and did not decline at MRRTC. In the wet season, the yield decline of IR8 was highest at BRCES (> 0.2 t ha-1); at IRRI it was > 0.1 t ha-1 yr-1. Wet-season yields of IR8 or of the highest yielding entry (HYE) at MRRTC or VRES did not decline. Yield declines of the HYE were less than those of IR8. In the dry season, they were > 0.1 t ha-1 yr-1 at IRRI but no significant decline was observed at MRRTC or BRCES. In the wet season, they were in the order of 0.1 t ha-1 yr-1 at IRRI and BRCES. No significant wet-season yield decline was observed at MRRTC or VRES. Declining yields at IRRI are thought to be largely due to B toxicity, Zn deficiency, increased disease and insect pressure and lodging. Their causes at the other sites are not understood. IRRI has initiated experiments to examine this tissue.

(PDF 0-2 workdays service)

Accession: 006839399

Submit PDF Full Text: Here

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Related references

Katyal, V.; Gangwar, B.; Gangwar, K.S., 1998: Trends in rice yields as influenced by long range cropping and manuring in rice-rice system. Grain yield data for 1977-92 from 4 sites in India were analysed for unfertilized rice and for rice given 120:80:40 kg N:P2O5:K2O/ha. Changes in soil nutrient status, and equations describing yield trends in kharif [monsoon] and rabi [winter] rice...

Ramos, M., 1982: Intensive cropping of irrigated rice in several regions of Santa Catarina. In field trials along the Itajai River and N. Santa Catarina, Brazil in 1977-80, opt. sowing dates and soil management for double cropping of irrigated rice cv. Labelle were studied. Grain yields of the 1st crop were most stable (5.7-6.8 t/ha) whe...

Anonymous, 1976: Intensive cropping: effects of catch cropping, multiple cropping, mixed cropping and intercropping on soil properties and crop yields. This mainly technical bibliography includes some references dealing with economic and social aspects of intensive cropping.

Marchezan, E.; Coradini, J.Z.; Avila, L.A.; Segabinazzi, T., 2001: Efficiency of evaluation of red rice seed bank in predicting irrigated rice field infestations and irrigated rice yields after two years of crop rotation and fallow. Seed bank evaluation is the best way to estimate the efficiency of red rice control methods throughout years. However, due to the precision degree of this methodology there are some doubts about its correlation with future red rice infestations wh...

Garrity, D.P.; Zandstra, H.G.; Harwood, R.R., 1978: A classification of philippine upland rice growing environment for use in cropping systems research. The process of fitting optimal cropping patterns to different physical environments requires an environmental classification that reveals predictive information concerning the biological performance of cropping patterns at different locations. A m...

Albinet, E.; Cretescu, I., 1993: Research on some elements in cropping technology and their influence on yields and industrial value of irrigated sugarbeet under Moldavian conditions. In 1976-78 on a cambic chernozem 9 Romanian sugarbeet cultivars and lines were harvested on 3 dates between 15 Aug. and 15 Oct. Root yields were 51.4-61.7 t/ha from the Aug. harvest ( 62.6-73.8% of the Oct. harvest). Hybrids D2006, D2011, H2517 an...

Ladha, J.K.; Himanshu Pathak; Tirol Padre, A.; Dawe, D.; Gupta, R.K., 2003: Productivity trends in intensive rice-wheat cropping systems in Asia. The rice-wheat system occupies 24 million hectares in South Asia and China and is important for the food security of the region. Recently, concerns have been raised regarding the stagnation and, in some cases, decline in the productivity and susta...

Olk, D.C.; Cassman, K.G.; Mahieu, N.; Randall, E.W., 1998: Conserved chemical properties of young humic acid fractions in tropical lowland soil under intensive irrigated rice cropping. Increasing cropping intensity (i.e. number of crops per year) of irrigated rice seems to cause an accumulation of phenolic compounds in the soil organic matter (SOM). We have studied the chemical nature of SOM in a broad range of soil types at dif...

Hoque, M.Z.; Hobbs, P.R.; Miah, N.I.; Nure E.E.ahi, ; Ahmed, A.U.; Sobhan, A., 1977: Research for suitable cultivars for intensive rice-based cropping systems. In 1974-7, especially in the boro season, 27 variety trials were conducted on 10 crops. The most promising cv. that are suitable for intensive rice-based multiple cropping systems were: direct-sown aus rice cv. Marichbati, Dular, IR2071-625-1-252,...

Hauser, E.W., 1979: Highlights of weed research in corn, intensive cropping peanuts, rice and sugarcane. A review.